Tag Archives: reloading

Debunking Ballistic Myths

by Woodsbum

I have run across this article MANY times, but it seems to be harder to find on Google for some reason. Due to this, I have decided to just copy it here primarily for my own uses. I really love this article…..



Put a bunch of hunters together at a favourite watering hole, or around a hunting campfire, and at some point, talk will almost certainly turn to stopping power, killing power, and matters relating to the way a bullet performs on an animal that is on the receiving end. You are bound to hear about kinetic energy, Taylor’s knockout formula, momentum theory, and other impressive sounding terminology which compares the terminal ballistics of one bullet to another.

I too have spent many hours debating and arguing with fellow amateur ballisticians about the efficacy, or lack thereof, of bullets and their effects on target animals (or people).

I think it comes with age but, with close on sixty summers behind me, I have come to realize that we are extremely gullible creatures, and will readily believe almost anything which appears in print–especially articles written in gun magazines. We accept in most case what is written as ‘gospel’. I am no longer as gullible as I used to be in my younger days–I now question and put everything to the test.

When it comes to terminal ballistics, the effect that a bullet has on a living target, I began to question the prevalent thinking many years ago. Based not on any personal profound knowledge of ballistics, which is a very complex science, but on personal experience, when on many occasions, I was astounded to see how many foot pounds of energy an elephant or buffalo could soak up before finally dying.

My suspicions were recently confirmed by the work of a professional ballistician, who chooses to remain anonymous, in a series of excellent articles that exposes most of what we have come to accept as sound ballistic principles, as overly simplistic at best, and pure myth at worst.

His arguments are absolutely sound. So let’s have a look at some of the ballistic myths he puts to rest.

The popular misconceptions he addressed were:

  • Taylor Knock Out (TKO) formula

  • Momentum and “stopping power”

  • Threshold of wounding potential based on kinetic energy

  • Optimal Game Weight (OGW) formula

  • “Energy dump”, “over penetration” and “hydrostatic shock”

  • Lethal Index formula

  • Knock-Out Value (KOV) formula

According to Taylor’s formula a hand thrown baseball will have twice the TKO of the standard nitro express load. Bouncing the baseball off the noggin of an elephant is unlikely to produce any positive results

Taylor Knockout (TKO) formula

Taylor’s Knock Out (TKO), a formula based on the experience of the renowned African hunter John Pondoro Taylor, is one close to the heart of many amateur and (supposedly) professional ballisticians and hunters alike. It states the following:

TKO = Bullet weight (pounds) x Impact velocity (fps) x Bullet diameter (inches).

Now in mitigation of the formula, it must be remembered that Taylor suggested it at a time when there was a cult following of small caliber, high velocity hunters who ventured into the African bush and often experienced dismal failures, unfortunately with fatal consequences. His formula was no doubt in reaction to this, and included his bias towards the bullets and cartridges he favoured and knew to work reliably.

The problem with this formula is the following:

“This formula is as misleading as any kinetic energy figures…I have seen”. The inadequacy of this formula is soon exposed, when it is pointed out that a hand thrown baseball has no less than twice the TKO of the standard Nitro Express (NE) load!

Taylor himself admitted that there was no appreciable difference in the killing performance of the various .400’s, .415’s, .450’s, .465’s, .470’s, .475’s and 500’s on dangerous game when loaded with reliable bullets of sound construction (Ah ha! Here lies the rub.). The TKO, as most commonly interpreted, exaggerates any difference that might exist because it makes the bore diameter equally as important as the velocity. When comparing a .450/.400 NE and a .500 NE using his formula, the latter is calculated to be 55% more potent, even though Taylor himself admitted to them being very similar in killing performance. So, things do not appear as they seem.

It must be stated in Taylor’s defence however, that he never intended it to be used as an indicator of killing or even “shocking” performance for hits on the body. He indicates that the “stunning” effect calculated by his formula applies for the most part to near misses of the brain on elephant. He made the point that even a “stopping rifle” was ineffective with poor shooting:

“Both barrels from a .600 in the belly (of an elephant) will have little more apparent effect than a single shot from a .275 in the same place.” (African Rifles and Cartridges, Taylor. Page 59).

Promotion of this formula is a prime example of the careless way in which a quasi-scientific method is seized upon, even though the originator may reject that purpose to which it is put.

Taylor’s use of bullet diameter, instead of cross sectional area, is in fact mathematically incorrect, as a bullet having twice the diameter to a smaller one has in fact more than twice the cross sectional area.

Momentum and “stopping power”

There is another bunch of armchair ballisticians that favour the use of momentum (in isolation) being a good measure of stopping power. I admit to having been one of these, because the thought behind it seemed to lend more credence to the performance of lower velocity, big bore cartridges, than what the kinetic energy story told. It is demonstrated that arguments made by this theory in support of “stopping power”, turn out to be just as weak as those in support of kinetic energy in isolation, which we will look at presently. The only time that momentum appears to hold a measure of validity is if a heavy bullet of .577 or .600 Nitro Express (or larger) passes close to an elephants brain through the spongy skull surrounding it. The impact of this blow in some cases can stagger the animal.

Problems with this theory are indicated as the following:

Momentum on its own as an indicator of “stopping power” is meaningless if bullet construction and other factors are ignored.

The following example is presented which expose the fallacy of momentum on its own being an acceptable indicator of stopping power:

You have a three pound spear traveling at 50 fps and a three pound gel-filled bag traveling at the same velocity. They have equal mass and momentum. Which one would you prefer to be hit by? Logic soon identifies which object is likely to be the most lethal without having to resort to field testing! It is also rather interesting to note that the momentum of the above two projectiles is almost identical to that of a factory loaded 500 grain .458 Winchester Magnum. Do you possibly think that an elephant or buffalo would be staggered by the impact of a three pound gel filled bag thrown at it at 50 feet per second? The answer is self evident. See Figure 2. Clearly momentum theory on its own falls way short of reality, so this formula can also be filed away in the redundant folder.

Threshold of wounding potential based on kinetic energy

This theory implies that the more kinetic energy a bullet possesses, the more stopping power it has, and the quicker it will dispatch an animal – i.e. Ek=1/2mv2

Why does this formula not hold water?

Kinetic energy on its own as an indicator of “stopping power” is meaningless, because bullet construction and other factors are ignored. Consider two bullets of the same calibre (say .308 Winchester for example) and mass. Bullet A travels at 50 feet per second faster than bullet B. Bullet “A” (a non-expanding bullet) may have more kinetic energy, according to the formula, than bullet “B” (an expanding soft point), but if the construction of bullet “A” is of such a nature that there is no expansion, and it drills right through the target creating a very narrow wound channel, it is likely that the animal will run off and not expire very quickly. If bullet “B” holds together, and mushrooms well to create a wide and deep wound channel, it will drop the target animal quicker than bullet “A”.

Because a quantity of kinetic energy is not, in and of itself, sufficient to adequately describe the wounding characteristics of a bullet, does not imply that kinetic energy is not a valid measure of ballistic performance. It is, but not on its own, because there are other variables which have to be factored into the equation.

We also know that when we drive a bullet at very high velocity the probability of it breaking up on impact and causing a shallow (non-lethal) cratering wound is increased. If we take that same bullet (same mass), and drive it at a lower velocity (which will equate to a lower kinetic energy), we will reach a point where we will have good penetration which will result in a greater effect on the target.

Optimal Game Weight (OGW) formula

First appearing in the April 1992 issue of GUNS magazine, the OGW formula was reported to be the result of careful experimentation taking the various contributions of kinetic energy, momentum, bullet sectional density, bullet diameter, bullet nose configuration, and a number of other criteria into consideration. The author did not elaborate on his experimental methodology, but came up with the following formula:

OGW (lbs) = Velocity (fps) 3 x Bullet weight (grains) 2 x 1.5 x 10-12

The weakness of this formula is soon exposed when the following are considered:

The OGW formula is nothing more than kinetic energy multiplied by momentum, then multiplied by some constant to arrive at the desired weight range.

There is nothing magical about the answers presented by this formula. It is based entirely on the result of a subjective choice of the constant (i.e. 1.5 x 10-12), divided by the acceleration due to gravity.

The OGW formula does attempt to combine the separate contributions of kinetic energy and momentum, but however well intentioned this may be, multiplying the two values together is not an unacceptable method of deriving a composite effect. The following illustrates why this is so:

An 85-grain .243 calibre light game bullet with a velocity of 3500 fps. has an OGW rating of 389 pounds at the muzzle. A 575-grain ball traveling at 850 fps has an OGW rating of 305 pounds. The former bullet is appropriate for small, light and thin skinned game and the latter “to stop charging tigers”. The OGW has little application to reality.

Although the author mentioned taking “kinetic energy, momentum, bullet sectional density, bullet diameter, bullet nose configuration, and a number of other criteria” into consideration, the effects of sectional density, bullet diameter, and nose configuration appear nowhere in the formula, and bullet construction is glaringly neglected in the article.

By making velocity a third order term, it wildly exaggerates the effect of this component in terminal bullet behaviour, which has surprisingly little effect for deforming bullets.

Another formula bites the dust.

“Energy dump”, “over penetration” and “hydrostatic shock”

The basis of these somewhat similar theories is that a bullet, which remains inside a target, is more effective (in terms of stopping or killing power) than one, which completely penetrates and passes through because all the energy is “dumped” into the target. If it passes through, the residual energy still contained within the bullet is wasted (see Figure 3). If the energy is not wasted on exit, it is deemed to have been more effective by having exhausted itself entirely on the target animal.

What’s wrong with this theory?

If a bullet “overpenetrates” (comes to rest under the skin on the opposite side of the entry hole), or passes right through, ineffective “stopping power” is not due to wasted energy, but “undercavitation”. In other words, the wound channel created by the bullet (i.e. the cavity) must be of sufficient diameter to cause enough damage to vital organs.

It makes no difference then if the bullet passes partially or right through the target, as long as it penetrates enough to reach vital organs. Wasted energy is irrelevant if the wound channel is of sufficient diameter being a wound track of 0.75 – 1 inch in cross section (19 -25mm) through heart, lung or major arteries.

If one considers a bullet which enters the target, does not exit, dumps all its energy but fails to hit any vital organ along the wound track, all the energy of the bullet may have been expended on the animal, but it is likely, despite the “energy dump”, to still run off and take a long time to die.

From the standpoint of efficiency, the ideal case would be when a bullet penetrated enough to barely exit the opposite side. However, this is a distinct difference between efficiency and effectiveness.

Most experienced hunters prefer an exit wound as it leaves a better blood trail.

The rate of energy transfer is vastly more important than the quantity of energy transferred.

It is not the energy itself that kills; it is the character of the work done by it.

There is no such thing as “hydrostatic shock”. The energy pulse originating from a bullet entering the watering medium of living tissue is not static. It moves and is therefore dynamic.

Lethal Index formula

John Wooters the well-known gun writer, frustrated by the litany of kinetic energy figures, suggested a formula that, he believed, was a more reliable indicator of a bullet’s effectiveness on live game. Unlike the Taylor Knock Out rating, the Lethality Index (or L factor) is intended to be a measure of effectiveness on thin-skinned game by expanding rifle bullets:

LI=Kinetic energy (ft. lbs) x Sectional Density (SD) x Bullet diameter (inches)

This theory is questionable for the following reason:

Large calibre bullets admittedly do make bigger wound channels than small calibres, kinetic energy is a valid component in the measure of wounding, and bullets with a high sectional density penetrate deeper and expand without coming apart (all things being equal). But, all things are not on an equal footing and this formula, like others that don’t even take bullet performance into account, cannot be considered a meaningful measure of terminal effect.

This formula is an assessment of the potential of a specific cartridge-load combination and its components at the muzzle. Downrange performance of otherwise identical loads can be very different and that sectional density, in particular, is an unreliable indicator of bullet performance.

And so RIP (Rest in Peace) Lethal Index Formula.

Knock-Out Value (KOV) formula

This formula was invented by a South African by the name of Chris Bekker and is based on a simplified, but slightly erroneous, “terminal momentum” calculation:

KOV = “Terminal momentum” (lb. ft/s) x Sectional Density (S.D) x “Mushroom factor”


Terminal momentum = Impact velocity (fps) x Retained bullet weight (lbs)
Sectional Density = Original bullet weight (lbs) / Bullet diameter (inches)

At first glance this formula appears to be moving in the right direction but fails on closer scrutiny?

Why should it be “terminal momentum” multiplied by sectional density? Why not kinetic energy multiplied, or divided by, expanded frontal area, for instance? From where did this insight arise?

Where is the physical evidence justifying a “Mushroom Factor”, and who decides on the value of this arbitrary factor?

The only evidence that the author presents to support the validity of his theory is in the form of comparisons to other “indices” and “factors” or to kinetic energy alone. No documentation or analysis is provided to show how these relationships in the KOV were derived. When the support of field evidence is drawn upon for evidence it is entirely subjective. This sort of reasoning does not qualify as scientific argument or evidence.

None of the mathematical dexterity demonstrates anything other…. than to satisfy ones preconceived notions about how things are expected to work.

Pseudo science

What is the root cause of all this erroneous of ballistic misunderstanding? The author of the articles justifiably lays it at the door of pseudo science. He points out that “to be meaningful and scientifically sound (correct and true), a formula or theory must be founded on carefully collected test data, not “gut feelings”, prevailing perceptions, and anecdotal evidence (which is little better than hearsay).

Scientific, analytical methods, and measures must be as objective and quantitative as possible. Consequently, theories of terminal effects of bullets must be evaluated in quantitative terms, meaning that dimensions of wounds must be evaluated, and together with a host of other factors, be taken into account. None of the formulas discussed in this article can be quantitatively defended with a study of field results– there are too may anomalies and variations to be explained away.

Field experience, without carefully planned scientific record taking and analysis, is almost useless. Science is founded on fact which can be examined and tested by any individual. Unfortunately in the hunting world, there are many pseudo scientists. People like myself who have intense interests in ballistics, but who are not scientifically trained ballisticians, often come up with subjective theories, which somehow take root and become accepted as “gospel”.

Unfortunately, terminal ballistics is a lot more complex than what we would like it to be. So many of the theories and formulas that have been suggested have been over simplified, because they have been put forward by individuals, some of whom admittedly may have extensive field experience, but have no formal scientific training in the field of ballistics in which mathematics, involving complex calculus and differential equations, are the order of the day.

Then again, there may be trained ballisticians who have little knowledge of anatomy and physiology, and the response of a body to the effects of a bullet. There are so many variables, and to neglect even one or two would provide answers that are not a reflection of the truth.

Let us just for a moment list some of the variables involved in how a bullet performs on contact with, and entry into living tissue, and what these mean in terms of a bullets knockdown performance, stopping power, lethality index, or whatever term equates to how quickly and efficiently it can kill an animal.

Looking first at the bullet and its terminal performance, here are some of the variables that come to mind (there are likely to be many more which I may not have taken into consideration):

  • The dimensions of the bullet (length and diameter) and changes that might occur as it is passing through living tissue, e.g. increasing diameter in expanding bullets.

  • Its impact mass and mass through the target (which will progressively decrease, and be largely determined by its ability to stay together, and influenced by the types of tissue encountered along the wound channel).

  • Its impact velocity and velocity through the target (which will progressively decrease and be influenced by the types of tissue encountered along the wound channel).

  • Its rotational energy and momentum at the point of impact and through living tissue.

  • Its impact momentum and momentum through the target (which will progressively decrease and be influenced by the types of tissue encountered along the wound channel).

  • Its impact kinetic energy and kinetic energy through the target (which will progressively decrease and be influenced by the types of tissue encountered along the wound channel).

  • The shape of the nose (angle of the ogive, ball, spitzer, flat nose etc.) and how it may change as it passes through living tissue).

  • The incident angle (i.e. the angle of the bullet as it impacts the target animal) – yawing, tumbling, flying straight, etc.

  • Rate of energy transfer.

  • Effect of the bullet caused by the density of tissue at the initial point of contact and along the wound channel.

  • The cohesive properties of the bullet (i.e. its ability to stay together and not break up) which will be determined by its construction

  • Soft nose, ballistic (plastic) tip, monolithic or FMJ construction.

And now let us for a moment consider the animal variables, which will affect the bullets performance:

  • The diameter and depth of the wound channel (there may be more than one if the bullet breaks up)–it may vary in size along the path of the bullet.

  • The path followed by the wound channel and structures encountered along the way. The diameter and path along the wound channel, as well as the number and type of vital structures destroyed or damaged along the way, will largely determine how fast the animal will lose blood, go into circulatory shock, or have the central nervous system disrupted and die.

  • The condition of the animal at the time of being shot (i.e. state of health). An animal in poor, weak or debilitated condition is likely to be more susceptible to the affects of a bullet.

  • Nutritional status of the animal at the time it was shot.

  • Mental state at the time of being shot. If in an excited state with high adrenaline levels, it may deal more efficiently with the shock resulting from being hit by a bullet.

  • Blood pressure.

  • Blood volume.

  • Rate of blood loss.

  • The rate at which living tissue, such as skin, connective tissue, muscle, tendons, ligaments, and bone resist the passage of a bullet.

  • The animal’s ability to compensate for blood loss (i.e. the compensatory phase of shock).

  • Respiratory and cardiac function.

And so on…

The point I am trying to make here is that there are so many variables involved, that none of the existing formulas come anywhere near to forecasting the predicted outcome a bullet will have on any given animal, assuming that the bullet arrives at its point of contact without having being deviated along its course from the muzzle by crosswinds, or having made contact with a twig or other object.

Cleve Cheney is a wilderness trail leader, rated field guide instructor and the author of many leading articles on the subjects of tracking, guiding, bowhunting and survival. Cleve has unrivalled experience in wildlife management, game capture and hunting, both with bow and rifle.
Click here to visit his site

I have read carefully through the work of the unknown ballistician, and found it to be accurate, consistent, reliable, credible, and well up to the test of scrutiny, and am in total agreement that none of the formulas we have been presented with to date, and which most of us have readily propagated, come anywhere near to accurately predicting the terminal performance of a bullet on a living animal.

And so for us who are fascinated by how projectiles fly and perform, it is time to rethink things that we have so gullibly accepted in the past.


Aagaard, F. Big Bore Rifles. Anon. Shooting holes in Wounding Theories: The Mechanics of Terminal Ballistics. Taylor, J.P. 1948. African Rifles and Cartridges. Stackpole Books, Harrisburg.


I give full credit to the author Cleve Cheney and have also included his references. Take a look at his site as well as African Exploration Magazine website for lots of other goodies.

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How Much Brass do I have?

by Woodsbum

I collect range brass everywhere I go. When I find spent cases from calibers that I reload, I am as giddy as a fat kid in front of a dessert buffet. The only problem I have run into was estimating how many cases I have collected. Of course I don’t want to sit there and count out every single one of my little treasures, so I was pretty pleased to find this basic chart. It only has a few calibers, but lucky for me I reload for all these except the .40 S&W.

Case weight chart

Case weight chart

Now I can get some relatively good guesses at how many cases I have collected without having to sit there and count out all my brass. A point to note is that these estimates are all based upon uncleaned, fired cases with the primer remaining…..  ie range scrounged pieces of candy!

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Understanding Headspace

by Woodsbum

This discussion has come up many times between myself and my friends once we started building ARs and putting old military rifles back together. The fact is that many explanations are just overly complex in the way that they present it or the polar opposite. Somehow there doesn’t seem to be any middle ground on this subject. Luckily, Hornady has put together a long list of videos that cover a multitude of subjects on their YouTube channel. Their hour long video on headspace is really what every reloader should watch to ensure that they fully know what is going on. Even though I grew up reloading there were many things in this video that helped me to make more sense out of the whole process.


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Pressure Curves for Semi-Auto and Bolt Actions

by Woodsbum

Who’d a thunk it? Cheaper than dirt has a blog that posts some really interesting articles. My father linked an article to me that I thought was quite well done. Not only did it address several things that many seasoned reloaders already know, but it really did a great job of putting the information into easy to understand language that even novice reloaders can follow.

Here is the article…..

Many times I link the article and then copy the post in its entirety to my site so that I can save it if changes are made on the original site. This time I just did a draft with the whole article copied (for my use) and am going to comment a bit on the original.

“Why?” you may ask. The answer is quite simple. I had someone that was trying to make money off their site request that I remove all links and material from one of my posts. Interestingly enough most of that content was taken from other sites, but instead of giving credit to the original authors she claimed it all as her own work.

Now I am just going to link things and save a draft copy for myself to reference and make comments. Sorry you might have to do some surfing, but hypocritical little bitches that complain when someone links and gives credit to her have made me change my mind on how I do things…..


The article brings up a few really good points about the gas operation of most semi automatic firearms. If you use too much or too little powder in the load, the firearm may not be able to self load another cartridge. There is a fine line where everything happens in literally milliseconds. The gases escaping from the ignition of powder in the cartridge are routed back into the action to actuate a process that ejects a spend casing and chambers another round. The timing on this process is critical. If it happens too quickly, there might not be enough time for the moving cases to be clear of each other. If it there isn’t enough gas the timing could be off where there isn’t enough power to eject the spent casing.

The other point that is brought up is the fact that the actual cases themselves must conform to a stricter sizing and length standard to be able to self reload. Fixed magazines in bolt action rifles are usually more forgiving than removable magazines. There is also a little more leeway given in the chambering process as well. If all else fails, the shooter has the opportunity to manually manipulate the cartridges or even modify their timing a bit to ensure that loading another round happens without incident.

All this can effect how you build your loads and the powder you use. This is where “slower burning” or “faster burning” powder variants come into the mix. There tends to be higher port pressure with the slower burning powders than faster burning variants. Be mindful that this distinction is based upon specific ranges that are suitable for your particular load. If some cartridges tend to be less accurate or cause failure to feed issues in your particular firearm, try to swap out for a different powder with a burn rate on the other side of the range.

Lastly, be aware that some powders are heat sensitive and change their burn rate depending on the weather. Some of the Reloader series are very susceptible to temperature variations.

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.300 Weatherby Information

by Woodsbum

Today I ran across an interesting article on the .300 Weatherby. For many years I have used mine mainly for elk and even reload for it. The rifle and cartridge has worked well for me once I got it all dialed in with a solid load. Recently I was able to get everything figured out where I am hitting the same spot time after time at 100 yards (of course strapped to a lead sled) with some 180 grain bullet loads. The truth is that I am now quite fond of both the rifle and the cartridge.

Unfortunately, there has been a lot of “bad press” about this cartridge due to people not representing the calibre correctly. Many misconceptions are out there about where this load fits in the whole scheme of things. This article really gives great information on the .300 Weatherby and explains where it might fit into your rifle collection.


.300 Weatherby Magnum


Based on the .300 H&H case blown out to maximum capacity, the .300 Weatherby Magnum was introduced by Roy Weatherby in 1944. Although the case design of the Weatherby was entirely different from the .300 H&H, enabling head spacing at the shoulder, Weatherby retained the belt at the case head, resulting in a very successful marketing ploy. The .300 Weatherby became the most popular cartridge of the Weatherby line and historically, is responsible for initiating the general trend towards ultra velocity cartridges. 
In 1963 Winchester released their .300 Winchester magnum as competition to the Weatherby cartridge.  The Winchester offering had two major advantages, inexpensive factory ammunition along with plainer, more utilitarian rifles as opposed to the Weatherby rifles which at this time, were often considered somewhat garish in appearance by many shooters. The Winchester cartridge and rifles appealed to more reserved hunters, the Weatherby to those that favored extreme velocities. Although the .300 Winchester Magnum became a major worldwide success, it took only a small share of Weatherby’s market, each style of rifle and cartridge appealing to different customers.
Today, the Weatherby remains popular as a medium game hunting cartridge but has come into its own as a long range hunting cartridge, utilized in both both factory and custom rifles. One could say that in this regard, the .300 Weatherby was 50 years ahead of its time as it has only been recently that suitable optics and range finders for long range hunting have been available to the public at affordable prices.


The .300 Weatherby Magnum is a truly powerful, highly effective medium game cartridge. This cartridge has however always suffered one major limitation – unrealistic expectations. In earlier years the Weatherby was promoted as being able to flatten anything that walked via sheer velocity. Extreme advocates of the .300 Weatherby have over the years made strongly convincing statements of this cartridges ability to cause such wounding that animals may be “blown in half” and that accordingly, shot placement when using the Weatherby is of low priority. Unfortunately, in many instances, the factors of bullet construction and precise shot placement were abandoned in favor of fantastical reasoning. 
In Africa, guides shuddered at yet another client toting a .300 Weatherby, another potential bullet blow up, a failed or slow kill resulting in hours of tracking and hard labor. In the South Island of New Zealand, shots would have to be taken at 300-400 yards, a challenge in the days before high power optics, range finders and drop charts. NZ guides would watch as shot after shot went down range at the nimble Thar and Chamois, the hit rate was low, gut shots were common. The term ‘Weatherby eyebrow’ also became common, a problem associated with short eye relief scopes on high recoiling rifles. Clients often had more of a chance of wounding themselves than their intended target. North American guides and Canadian guides had exactly the same experiences. All of this gave the .300 Weatherby a bad reputation which stuck for decades.
The strengths of the .300 Weatherby lie in its ability to produce effective killing on a wide variety of game species and body weights, out to ranges well beyond 1100 yards (1km). However, the .300 Weatherby cannot do all of these things with a single load, nor can it shoot itself. 
The .300 Weatherby Magnum can only be exploited through accuracy combined with appropriate projectiles for the job at hand. .300 Weatherby shooters must learn to be able to differentiate between rifle accuracy problems and shooter error. Practice is key if any level of proficiency is to be obtained. In platforms which induce intolerable or uncontrollable recoil, a muzzle brake should be fitted to aid accuracy.
Choice of optics for .300 Weatherby rifles is also very important in order to avoid the dreaded Weatherby eyebrow (scope cuts to the eyebrow) and the flinch that develops both before and after injury. Short eye relief scopes should be avoided and shooters need to understand that short eye relief scopes can be found within most brands (including high end optics such as Zeiss and Swarovski). When selecting a scope, the shooter must observe ‘models’ rather than brands to obtain correct eye relief information. Appropriate scope eye relief for the .300 Weatherby (actually all of the .300 Magnum family) unbraked is 4”.  
Loaded with 150 grain bullets, the .300 Weatherby is a spectacular killer of lighter medium game. Penetration can occasionally be somewhat poor with conventional projectiles when used at closer ranges on large bodied animals. In general, on light game weighing 40 to 60kg (up to 130lb) 150gr conventional or  premium bullets driven at 3450fps produce a wound channel through vitals of between 2 and 3” in diameter, resulting in exit wounds of the same diameter, when used at close to moderate ranges. On game weighing between 60 and 90kg (130-200lb), internal wounds may be 2-3” in diameter, however 150 grain conventional bullets may or may not exit depending on bullet construction and bone encountered. Premium 150 grain bullets such as the Nosler Partition, Scirocco and InterBond will in most instances exit, rendering a 1.5 to 2” exit wound. A 150gr bullet does provide some room for error when matched appropriately to game weights. 
In the .308 Win and .30-06, traditional 165 grain hunting bullets quite often produce clean but delayed killing on light framed game. Accordingly, one might expect that the velocities of the Weatherby would ensure more emphatic results. Unfortunately, this does not prove true, at least not in a uniform and predictable manner, especially at extended ranges where cartridge performance overlaps. While some bullet designs such as the 165 grain SST can prove to be spectacular killers of light framed or lean game, often the results are the same as those derived from the .308 Win and .30-06. Again, the 165 grain bullet weight proves its merit when used on medium body weights of between 80 and 150kg (180-330lb). Such results also help us understand that the immense power of the Weatherby is best utilized as a means to obtain fast killing at extend ranges, not increase killing power within ordinary hunting ranges (300 yards).  As stated however, there are exceptions, the Hornady 165 grain SST is immensely and positively responsive to increased velocities.
Loaded with 180 grain bullets the Weatherby is an emphatic killer of larger bodied medium game out to generous ranges. The Weatherby places great stress on projectiles, demanding that bullet construction be matched to game weights in order to avoid erratic or unexpected disappointing results. On game weights of between 90 and 300kg (200-700lb) wound channels produced by appropriate 180gr bullets driven at 3250fps tend to be around 1.5 to 2” in diameter. Conventional 180gr projectiles produce similar sized wounds to premium 180gr bullets but at Weatherby velocities are extremely prone to gradual and total disintergration, rapidly decreasing the depth of wounding at close ranges.
Many 180gr to 200gr .30 caliber bullets driven at Weatherby velocities are close to ideal for use on Elk simply because the thickness of the shoulder corresponds with the distance traveled before many 180 to 200gr bullets (both conventional and premium) reach full wounding potential. The width of an Elk chest corresponds with the distance most 180 and 200gr bullets travel while creating the broadest part of their wound channel.  The wound channel gradually tapers to a size not much bigger than the mushroomed projectile as it comes to rest or departs the skin of the offside shoulder. 
When enough resistance is met, 180 to 200 grain bullets may bore an internal wound through vitals of approximately 2 to 3” in diameter. On lighter game however; wounding with 180-210 grain bullets tends to be much smaller, around 1”, with little or no hydrostatic shock, greatly decreasing room for error, regardless of muzzle velocities or range. At longer ranges where velocities approach those of the .308 Winchester (around 300 yards), room for error drops substantially and accurate shot placement is paramount. Rifles that cannot shoot 1 MOA or less at 100 yards may cause slow killing and in precipitous country this often results in the frustration of an un-retrievable animal that has tried to escape into safe inaccessible terrain but died in the process.
Loaded with 200-220 grain bullets, the .300 Weatherby can be utilized to great effect on very large game. Again, bullet construction is of immense importance when using the Weatherby on tough game. On game such as Grizzly bear, the heavy Swift A-Frame and Woodleigh bullets are bread and butter, producing highly traumatic wounding and deep penetration for fast, clean and humane killing. On truly heavy game, the .30 calibers, regardless of muzzle velocity, lack the ability to produce deep broad wounding with ordinary cross body shots. On heavy game, neck and head shots with premium projectiles produce emphatic results.
Loaded with heavy, frangible, high BC projectiles, the .300 Weatherby is an excellent long range hunting cartridge filling a game performance niche that no other cartridge apart from the .300 Dakota fills. Case capacity of the Weatherby is about as large as this bore diameter can handle (gas expansion) without going overboard towards the realms of extreme bullet jump and severely shortened barrel life. While the freebore of the Weatherby is long, the equally long case neck acts as a reliable guide, having more in its favor than the .308 Winchester freebore design. Loaded with heavy frangible bullets, the Weatherby can be expected to produce fast killing on a wide variety of body weights out to ranges exceeding 1100 yards.
The strengths of the .300 Weatherby (and .300 Magnum family) can be found when used on game weighing between 90 and 320kg (200-700lb) at ranges of 300 yards and beyond, achieving results that cannot be found in the sevens and smaller calibers, regardless of down range trajectories. The trade off is recoil. The .300 Weatherby produces a level of recoil that must be tamed through either design and technology or technique and personal discipline, in order to obtain optimum results.

Factory Ammunition

Light weight loads from Weatherby include the 130 grain Barnes TTSX at 3650fps, the 150 grain Hornady soft point Interlock and the 150 grain Nosler Partition at 3540fps (26” barrels). Due to the twist rate of 1:10 utilized in Weatherby factory rifles for optimum accuracy with heavy bullets, while some rifles may produce excellent accuracy with 130-150 grain bullets, results vary.
The 130 grain TTSX bullet is a relatively new offering from Weatherby and although its weight may seem negligible, 130 grains is about perfect for a homogenous .30 caliber bullet for use on light through to medium weight antelope and deer species along with wild boar. This load is perfectly adequate for tackling game weighing up to 150kg (330lb), rendering broad internal wounding for fast killing, yet often showing minimal meat damage as velocities fall below 3000fps. The 130 grain TTSX does its best work at impact velocities above 2200fps or approximately 500 yards.  
The 150 grain Hornady Interlock is best suited to light game under conditions where raking shots do not have to be taken at close ranges, producing best results between the ranges of 125 and 425 yards.  Beyond 425 yards, wind drift starts to become a problem for the Interlock (and Partition). The 150gr Partition is an excellent projectile for use on game weighing up to 100kg (220lb) and at ranges beyond 125 yards, is adequate for game weighing up to 150kg. If the 150 grain Partition is pushed too hard, such as on large tough animals at close ranges, there is a small risk of jacket / rear core separation. The Partition is a stellar performer, producing wide, violent wounding for fast killing but hunters must be realistic about limitations. Sectional density versus game weights must always be taken into consideration when using the Partition. The 150 grain Partition produces excellent wounding down to velocities of 1800fps (750 yards) however wind drift is a major limiting factor.

Weatherby currently list three 165 grain loads including the Interlock (flat base) at 3390fps, the 165 grain Ballistic SilverTip at 3350fps and the 165 grain Barnes TSX at 3330fps. The 165 grain Hornady projectile has a much softer jacket than the Ballistic SilverTip. Best suited to game weighing up to 90kg if used at woods ranges, the Interlock produces its most uniform results on game weighing between 80 and 150kg (180-330lb) at impact velocities of between 3100 and 2200fps (between 100 and 500 yards) though still showing vivid expansion at 2000fps. This is a good, fast killing load, suitable for a vast range of deer species and should not be overlooked.
The 165 grain BST is a flat shooting projectile with a BC of .475 as opposed to .387 for the Interlock. However; as ranges are increased, the BST can produce delayed killing (regardless of excellent wounding) on lean game (under 90kg/180lb) with rear lung shots. In contrast, the Hornady bullet would have produced slightly delayed killing, rather than a long ‘dead run’. Both of these 165 grain bullets are immensely useful but there is a definite requirement to match game weights to bullet construction. The subtleties of this can be difficult to explain. For example, the BST is frangible at close ranges but the slight delay (perhaps only .5” of penetration) can inhibit hydrostatic shock transfer (see game killing text) via the ribs to the spine and through to the brain. So while internal wounding can be broad, lean game may run, in some cases being lost in ravines (a curse of alpine hunters). As body weights increase slightly, tipping my often quoted 90kg (180lb) mark, the target resistance is matched to bullet expansion, resulting in very emphatic killing.
Weatherby’s tough 165 grain TSX load has its strengths, suitable for game weighing between 90 and 320kg (180-700lb). On large animals, especially at impact velocities below 2600fps, hydrostatic shock can be non-existent and wounding can be a little narrow. Again, best results are obtained by matching body weights to bullet construction.
Weatherby 180 grain offerings include the Hornady Interlock (flat base) at 3240fps, the BST at 3250fps, the Partition at 3240fps, the Accubond at 3250fps and the 180gr Barnes TSX at 3240fps. Weatherby’s 180 grain loads are best suited to game weighing above 90kg (180lb). The five loads offer varying rates of expansion, suitable for a wide variety or game weights of up to 450kg (180-1000lb). 
The 180 grain Interlock and BST loads are, like the 165 grain loads, best suited to game weighing between 90 and 150kg but at extended ranges of around 300 yards and beyond, can be very emphatic on game weighing up to 320kg (700lb). Put simply, increasing range increases bullet performance on larger bodied animals.
The 180 grain Partition is a versatile bullet, rendering deep, broad wounding on game weighing up to 320kg (700lb) and is about ideal for Elk. From a muzzle velocity of 3240fps, the Partition can be expected to produce deep, broad wounding down to 1800fps or 780 yards. The Partition can be asked to tackle larger body weights of up to 450kg (1000lb) but not at woods ranges with ordinary chest shots due to the risk of jacket / rear core separation should the Partition strike ball joints. As with all of the .30’s, on heavy game, neck and head shots ensure emphatic results, minimizing incidents of insufficient penetration (such as the close range/ball joint example). At longer ranges, the Partition shows adequate penetration on heavy game but, due to the limitations of the bore diameter, can produce narrow lung wounding (proportionate to game weights). As always, readers are advised to study and record autopsy results, take photo’s, monitor wounding and penetration in order to provide sound conclusions.
Weatherby’s 180 grain Accubond load is ideally suited to game weighing between 90 and 320kg out to ranges of around 575 yards. Somewhat of an oddity, the Accubond will often produce delayed kills on lean game due to the slightest delay in expansion (minimal target resistance) yet at the other extreme, when the Accubond encounters too much body weight, it suffers severely limited penetration and wounding. This is one of many projectiles that are about ideal for ridge to ridge shooting of Red deer, Mule Deer, Caribou, Himalayan Thar and at the upper end, Elk.
For tough game, the 180 grain Barnes TSX at 3240fps is a good performer. It is definitely true that the faster the Barnes is driven, the better, working well with the Weatherby ethos. Ideally suited to game weighing above 150kg (330lb), the TSX produces violent wounding for fast killing out to ranges of around 300 yards, steadily declining in wounding potential thereafter. On truly large heavy game, the 30 caliber TSX can produce narrow wounding, regardless of full cross body penetration. Again, this is a limitation of the bore diameter, not the bullet design.
Weatherby list two heavy loads, the 200gr Partition at 3060fps and the 220gr Hornady round nose bullet at 2845fps. The 200 grain Partition is a very versatile bullet, boasting an excellent balance of high SD versus high velocity, versus fast expansion, essentially ticking all of the boxes. Yet still, this load does not make the .300 Weatherby ideal water buffalo medicine. Great strengths combined with realistic expectations are the key. This load is very well suited to North America and Canada’s large game species, at both close ranges as well as long ranges of up to 700 yards or so (1800fps). Deep, violent, highly traumatic wounding are hall marks of the 200 grain Partition driven at high velocity. Weatherby’s heaviest load, the 220 grain Interlock is unfortunately, a lack luster performer on large animals. This is an extremely soft jacketed projectile, more suited to game weighing up to 150kg (330lb) at woods ranges. Used this way, the 220 grain Interlock load displays great strengths.
Remington currently list one load for the Weatherby, the 180gr Core-Lokt at 3120fps. The economical Core-Lokt is an excellent 90 to 180kg (200-400lb) game bullet and is less prone to blow up than the 180gr Interlock, also producing adequate performance on large body weights of up to 320kg (700lb) as velocities fall below 2800fps (125 yards). The Core-Lokt has a low BC of .383, losing velocity rapidly and suffering wind drift accordingly, producing best performance inside 400 yards.
Federal currently list three180gr loads for the Weatherby, the 180 grain Partition at 3190fps, the 180gr Trophy Bonded Bear Claw (now featuring a polymer tip) at 3100fps and the 180 grain TSX at 3110. As has already been described, the Nosler partition is an excellent projectile, about ideal for Elk. The TTBBC offers a unique level of performance that cannot be under-estimated. This projectile has the ability to render heavy trauma throughout penetration, producing emphatic and ‘safe’ kills on tough game. The TTBC has a BC of .480, not exceptionally high but great enough to deliver immense trauma out to a range of 250 yards, retaining good performance out at 350 yards (2400fps). Below 2400fps, wounding gradually becomes narrower, more so and especially at 2200fps and below. It is odd that Federal list the TSX alongside the TTBBC loading, overlapping performance. A frangible long range projectile such as the Speer 180 grain BTSP would add more versatility to the Federal line up.  

Hand Loading

As a hand loading proposition the .300 Weatherby has had a somewhat jaded past. Most hand loaders and powder manufacturers working up loads in the Weatherby, from the 1950’s through to the 1980’s, were either unable or unwilling to try and achieve Weatherby’s advertised velocities and instead, loads duplicated what hand loaders were already achieving in the .300 Win mag with figures of 3300 and 3070-3100fps with 150 and 180gr bullets respectively. Throat lengths also tended to vary from the generous free bore of the Mark V rifle to short throated designs, created towards a goal of optimum accuracy. It was also very common for hunters to dock the 26” barreled Mk V to 24” to make the rifles more portable. The Weatherby needs a 26” barrel, not just for velocity but also to keep weight, noise and muzzle blast forwards. Longer barrel lengths also show great strengths in these areas.
From a Factory standard 26” barrel, realistic velocities for the .300 Weatherby include 3450fps with 150gr bullets, 3300fps with 165-168gr bullets, 3250fps with 178-180gr bullets, 3150fps with 190 grain bullets, 3050fps with 200 grain bullets, 3000fps with 210 grain match bullets and 2900fps with 220 grain bullets. Individual rifles can achieve higher velocities than the above stated figures. In half throated custom barrels, velocity loss is in the order of 100fps, though again, individual rifles vary.
Twist rate of the .300 Weatherby is as mentioned, typically 1:10, ideal for bullet weights of 165 grains and heavier. In such instances where a light, fast expanding bullet is desired but accuracy is poor, bullet designs like the Hornady 178 grain A-Max are capable of achieving optimum results on light game.
Rather than continually reiterating bullet performance at magnum velocities, the section ahead will focus on some of the more effective projectiles that allow the .300 Weatherby to truly shine.
Of the Hornady bullet range, the light 150 grain SST and Interbond can be used to great effect on lighter game. The one limitation with the 150 grain SST, is that at close ranges where velocity is high, the projectile can sometimes meet too much resistance (water surface tension), failing to impart hydrostatic shock. On light framed game, regardless of whether bullet blow up occurs (due to ultra velocities), wounding through vitals is always thorough. The negative aspect of the SST is more to do with expectations than anything else, the disappointment of slightly delayed killing. The 150 grain Interbond does not produce this type of reaction at close ranges and, where these odd instances of hydrostatic shock failure do occur, the two projectiles can be used together, the InterBond for very close range work while being equally good out to ranges of around 350 yards, the SST coming into its own at 3200fps (after 100 yards).
The 165 grain Hornady SST driven at 3300fps is a violent, emphatic killer of medium game, a generally exceptional deer bullet. Again, this 165 grain bullet does its best work on game weighing between 80 and 150kg (180-330lb) with one caveat, by keeping the SST above 2400fps out to a range of 425 yards, speed of killing is increased on very light framed game where rear lung shots are taken. This makes for a very versatile, effective and emphatic deer bullet in the Weatherby. Along with this, the 165 grain Interbond can be partnered with the SST and used to great effect on body weights of 90-200kg (200-330lb), giving best performance out to the same quoted range of 425 yards.
Expectations are key when using the 180 grain SST on game in the Weatherby. When used at ordinary hunting ranges, this projectile does its very best work on game in the 80 to 150kg range, just the same as the 165 grain SST. The 180 grain SST can also be a spectacular killer of light framed game at impact velocities above 2600fps. If the 180 grain SST is used at ranges of 50-100 yards on game weighing 80-150kg, killing is fast and emphatic, yet penetration is often less than expected, the projectile coming to rest against offside skin. As velocity falls, performance is enhanced, wounding on raking shots is deeper, though the ogive of the 180 grain SST should be annealed (rotated) in candle flame for best results. On deer/antelope species weighing around 320kg (700lb), the 180 grain SST gives best performance between the velocity parameters of 2600 and 1600fps or approximately 300-950 yards. The tough 180 grain InterBond is as can be expected, an emphatic killer of large bodied deer out to moderate ranges. 
Hornady’s 178 grain A-Max can be used not just as a long range bullet, but as an alternative to the 150 grain bullet for use on light game. The 178 grain A-Max is an excellent performer on lighter body weights but on game weighing 90kg and heavier, is much more effective at longer ranges. Generally speaking, the 7mm and .30 caliber A-Max projectiles display best penetration at impact velocities of 2600fps and below.  On tough game, there is a marked decrease in penetration at impact velocities of above 2900fps.
As a long range hunting cartridge, the .300 Weatherby loaded with the 208 grain A-Max is a powerhouse. The 208 grain bullet produces immensely traumatic wounding right down to the typical 1400fps that is often quoted within this research. At low velocities, frontal shots on light framed game should be avoided, simply due to the wastage of the entire carcass. From a muzzle velocity of 3000fps (some rifles achieve higher velocities), the 208 grain A-Max travels around 1325 yards before breaking the 1400fps, reaching the sound barrier (standard atmospheric model) at a whopping 1730 yards. The 208 grain A-Max is ideal for a vast range of game, reaching its practical limits on Elk.
Speer’s traditional Hotcor and BTSP projectiles can be very useful in the Weatherby. The 150 grain Hotcor is a spectacular killer of light game within ordinary hunting ranges. The 150 grain BTSP is however, much too soft, if close range shots are encountered. The middle weight 165 grain Hotcor and BTSP both show great strengths, again on the body weights of 80-150kg (180-330lb). The 180 grain Hotcor, though so very basic in its design, is a hard hitting bullet, ideal for large bodied deer. The soft, highly frangible 180 grain BTSP also has great strengths and with its high BC of .545, can be used out to very long ranges. This is a bullet that excels on game weighing between 90-180kg (200-400lb) out to ranges of 900 yards (1800fps), continuing to produce adequate wounding on suitable body weights, as velocities fall to 1600fps. The 200 grain Speer Hotcor is a wonderful projectile, hard hitting and clean killing, ideal for large bodied deer and especially useful for woods hunting. BC of the 200 grain Hotcor is .478, delivering highly traumatic wounding out to ranges of around 350 yards.
As discussed in the factory ammunition section, the Nosler Partition projectiles are excellent performers producing fast, violent expansion down to 1800fps, along with excellent penetration. In many instances, performance is more spectacular and more uniform that either the Ballistic Tip or Accubond bullet designs. That said, the 150 grain Accubond produces outstanding results on light game, out to ranges of around 400 yards. The 180 grain Accubond is a stellar performer on larger bodied deer but on deer species weighing around 320kg (700lb), the 200 grain Accubond really comes into its own in the .300 Weatherby. The heavy Accubond is, like its kin, prone to shed as much as 50% of its weight after impact but offers a high BC, fast expansion, broad wounding and desirable penetration. This is an excellent cross valley hunting bullet.
Nosler’s 180 and 200 grain Partition bullets show great strengths on Elk sized game, but cannot be expected to produce entirely uniform results with chest shots on heavy game where the foreleg bones are 3” in diameter and the ball joints are of 5” in diameter or larger. The heaviest of the Partitions is the 220 grain semi point, capable of excellent penetration, again, not ideal for bovine sized game with chest shots but certainly effective on body weights of up to 400kg (880lb), tackling heavier game with ease if head and neck shots are employed.
Of the core bonded bullet designs for use on tough game, Woodleigh (Protected Point) and Swift (A-Frame) produce stellar performers. These two brands should always be the first consideration when hunting tough game, both offering 200 grain bullets, capable of withstanding magnum velocities with ease. These projectiles work extremely well at high impact velocities and the .300 Weatherby has no trouble keeping velocities well above 2400fps out to 300 yards or so. Swift also produce the highly traumatic Scirocco projectiles which are emphatic killers when bullet weights are matched to game weights accordingly.
Barnes bullets, as mentioned in the factory ammunition section, have great strengths and Weatherby have a great load in the 130 grain offering. The only negative aspect, is that the combination of the 1:10 twist rate, freebore and ultra velocities can prevent some rifles from being able to obtain optimum accuracy. Nevertheless, in rifles that produce desirable accuracy, the 130 grain TSX is a hard hitting, deep penetrating bullet, ideal for goat, deer and boar. As bullet weights are increased, penetration increases.
Barnes projectiles like to be put to work, the harder the Barnes TSX is made to work the better with 150 grain bullets working well on 150kg animals and 165-168 grain bullets on 200-320kg (440-700lb) animals. The 180 and 200 grain Barnes bullets are to some extent limited by the bore diameter, a somewhat difficult factor to explain, more easily recognized in the field. The heavy TSX bullets are capable of full cross body penetration on large, heavy game, but, regardless of muzzle velocities, wound channel diameters are not nearly as wide as is produced in the wider bores. The .358 225 grain TSX driven at mild velocities of 2500fps helps paint the full picture very clearly. But as a rule of thumb for the 180-200 grain Barnes 30 caliber TSX bullets, heavy body weights are the key, delivering fast killing on body weights of up to 400kg (880lb) at impact velocities of above 2400fps. As body weights approach 600kg (1300lb), regardless of exit wounding, delayed killing can be expected, limited by bore diameter, not bullet design. 
Berger’s 175-210 grain VLD projectiles are very useful in the Weatherby for long range hunting. These projectiles produce frangible wounding in the absence of high velocity (in the absence of disproportionate to caliber wounding) but do require that bullet weights be matched to game weights in order to initiate full fragmentation. The current 175, 185, 190 and 210 grain VLD designs work best on game weighing between 90 and 180kg (200-400lb) with the 210 grain VLD continuing to produce good performance on heavier body weights of up to 320kg (700lb). Full fragmentation can be expected at velocities as low as 1400fps. In instances where game encountered are much leaner than expected and where no bone is hit (liver shots), the cut off point for full fragmentation can be as high as 1800fps. Fortunately, the .300 Weatherby does its best to help, launching the VLD bullets at extremely high velocities, aiding retained velocity down range.

Closing Comments

Nearly 60 years on, the .300 Weatherby is finally coming into its own, thanks largely to bullet designs and optics, capable of utilizing the impressive velocities produced by this cartridge. Along with this, Weatherby now offer true long range rifles featuring full contour barrels and suitable stock designs.
This cartridge is a highly emphatic and often spectacular killer of medium game, tackling a wide range of body weights under a variety of conditions. Realistic expectations are the key to great success when using the Weatherby. Optimum performance can only be achieved through accuracy and unlike a more mild .30, such as the .308 Winchester, the Weatherby and its .300 magnum kin call for a greater level of attention and awareness towards both rifle accuracy and shooter technique. A poor shot with the .300 Weatherby is far less effective than a single and perhaps rather easily well placed shot with a .308. But when it all comes together, an accurate rifle chambered in .300 Weatherby Magnum, suitable projectiles and optimum technique, well that’s something.

Suggested loads: .300 Weatherby Magnum Barrel length: 26”
No ID   Sectional Density Ballistic Coefficient Observed  MV Fps ME
1 FL Wby 130gr TTSX BT .196 .350 3650 3845
2 FL Wby 150gr Partition .226 .387 3450 3964
3 FL Wby 180gr Partition .271 .474 3240 4195
4 FL Wby 200gr Partition .301 .481 3060 4158
5 HL 165gr SST .248 .447 3300 3989
6 HL 178gr A-Max .268 .495 3250 4174
7 HL 180gr Accubond .271 .507 3250 4221
8 HL 200gr Woodleigh PP Mag 200gr A-Frame .301 .450 3050 4130
9 HL 200gr Accubond .301 .588 3050 4130
10 HL 208gr A-Max .313 .648 3000 4156


Suggested sight settings and bullet paths           
1 Yards 100 200 341 382 400 425 450 475
  Bt. path +3 +4.5 0 -3 -4.6 -7.1 -10 -13.3
2 Yards 100 175 322 362 400 425 450 475
  Bt. path +3 +4.2 0 -3 -6.5 -9.3 -12.5 -16
3 Yards 100 175 307 349 375 400 425 450
  Bt. path +3 +4 0 -3 -5.3 -7.9 -10.8 -14.1
4 Yards 100 175 282 323 350 375 400 425
  Bt. path +3 +3.7 0 -3 -5.6 -8.3 -11.4 -14.9
5 Yards 100 175 310 352 375 400 425 450
  Bt. path +3 +4.1 0 -3 -5.1 -7.7 -10.7 -14
6 Yards 100 175 307 349 375 400 425 450
  Bt. path +3 +4 0 -3 -5.3 -7.9 -10.8 -14.1
7 Yards 100 175 308 350 375 400 425 450
  Bt. path +3 +4 0 -3 -5.2 -7.8 -10.7 -13.9
8 Yards 100 150 278 317 350 375 400 425
  Bt. path +3 +3.7 0 -3 -6.1 -8.9 -12.2 -15.9
9 Yards 100 160 287 329 350 375 400 425
  Bt. path +3 +3.8 0 -3 -4.9 -7.4 -10.3 -13.6
10 Yards 100 160 283 325 350 375 400 425
  Bt. path +3 +3.7 0 -3 -5.3 -7.8 -10.8 -14.1


No At yards 10mphXwind Velocity Ft-lb’s
1 400 12 2518 1830
2 400 11.5 2457 2010
3 400 9.2 2496 2490
4 400 10.5 2308 2366
5 400 10.3 2455 2207
6 400 9.4 2488 2446
7 400 9.1 2505 2507
8 400 11.6 2243 2233
9 400 8.4 2427 2616
10 400 7.7 2437 2743

 300 weatherby final.jpg

.300 WBY Imperial Metric 
A .532 13.51
B .512 13
C R.151  
D .492 12.5
E .336 8.53
F 2.504 63.6
G .321 8.15
H 2.825 71.76
Max Case 2.825 71.76
Trim length 2.815 71.46


After reading this article, I fully intend to work on solid loads in other bullet weights as well. Having the added variances for hunting different sized animals sounds like a great way to go. This is especially so since this article explains and matches bullet channel information with different bullet weights compared to different sized animals. 

I liked this article and will definitely be looking over this site for other interesting articles on other calibres.

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