The Accurate Reloading Forums THE ACCURATE RELOADING.COM FORUMS Hunting African Big Game Hunting Taylor's KO-Factor - - - how do you figure it? How does it apply to the question aboGo | New | Find | Notify | Tools | Reply | |
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What is the formula? Just found some figures...... 300gr @ 2550 fps from .375.......KO value of 40 400gr @ 2400 fps from .416 ......KO value of 57 400gr @ 2400 fps from .458 ......KO value of 62 400gr @ 2450 fps from .458 ......KO value of 64 [ 04-24-2003, 02:05: Message edited by: DB Bill ] | ||
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KO = mvd/7000 m = bullet weight in grains v = velocity in ft/s d = bullet diameter in inches Will | |||
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Bill, John "Pondoro" Taylor gave his formula in Big Game Rifles ('48) for knockdown power: mass of bullet (in lbs) times Velocity in ft/sec and diameter in meters Mike LaGrange discusses the various other measures (Hatcher's Relative Stopping Power and Art Alphin's shock power index) in his Ballistics in Perspective. jim dodd | |||
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quote:450 grain Kodiak X 2050 FPS X .510 divided by 7000 = 67.2 ....... in 7 pound lever gun = mucho fun and excitement with mr. bear ![[Big Grin]](images/icons/grin.gif){kind=icon} ![[Eek!]](images/icons/shocked.gif){kind=icon} KMule ![[Wink]](images/icons/wink.gif){kind=icon} | |||
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The main thing to remember about Taylors system was that he developed it to predict the performance on thick skinned game only (primarily Elephants) and using solids. It was never designed to predict results for todays premium controlled expansion softs on say the larger plainsgame, which is what the majority of visitors to Africa hunt today. | |||
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Tayler's KO values, are somewhat nebulous, some chamberings just seem to work better than his values would indicate, by his own admission! They are, however, far more accurate than useing Feet pounds of energy, as a guide! His KO values were developed for solids only, and do not work with soft points, as a rule. ![[Cool]](images/icons/cool.gif){kind=icon} | |||
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I understand that one of the salient factors in Taylor's calculations is that he uses the muzzle velocity only as a single multiplier, not squared as it is in calculations of foot-pounds. Thus, an increase in velocity does not give nearly as large an increase in Taylor's number as it does in calculations of muzzle energy of bullets in foot-pounds. In addition, Taylor uses the diameter of the projectile as a factor, but bullet diameter does not figure at all in calculations of the kinetic energy of projectiles in foot-pounds. [ 04-24-2003, 18:13: Message edited by: LE270 ] | |||
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quote:Correct, however a larger diameter bullet will cause more damage, thus the credit given to the diameter in Taylors calculations. You could have a projectile that weighs 500 grains that is as big around as a needle ... it would be 5 feet long. You can see how this would not cause such terrible results when fired into an Elephant. It would pass through him and he might not even know he was shot! Sure, it is a ridiculous and exagerated situation, but you can see my point. | |||
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I like Taylors KO values and reckon they're pretty accurate within the restrictions as laid out by Wendell. They're not perfect, but if you bear in mind that he worked them all out without the aid of modern day calculators and computers he did pretty well. | |||
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Taylor's KO factor is just momentum (pounds feet per second) weighted by bullet diameter in inches. He used the 7000 to 1 unit correction for grains to the pound, but he omitted the 12 to 1 corection of inches to the foot, for his unitless abstraction. His is an incomplete parlor game limited in application to brain shooting elephants with FMJ solid bullets of yore. For reckoning the ability to knock out an elephant with a near miss brain shot in the skull of jumbo. For a slicker game, throw in the 12 with the 7000 and factor in the unitless sectional density. Then multiply by 100 to convert the resulting 1.00 rating of the classic .375 H&H load to 100 (100% of the minimum effective DGR, oh my gosh what a coincidence, ordained from above?), and: Voila! This will correct for Frisbee shaped and needle like bullets. This is the Bwana Saeed Index, or BS Index. It measures "whomp" or payload delivery ability of big bore rifles. It is merely a ballistic scale. It is not rocket science. Neither is the Taylor KO value. You can find it under the FAQ section of this web site. Tongue in cheek on all these lethality indices, don't ya know? | |||
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One thing about Taylors figures, they seem to match actual field results as well as anybody elses, I suspect he juggeled his figures to match his experience, something a calculator, computer or balistics mathamatician has not been able to do... I would never doubt his opinnion on what kills elephants, to do so would be the ultimate in arrogance...His field experience was simply beyond anything we can imagine today. I have never found anything he said to be out of line including his choice of rifles and cartridges. | |||
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Ditto Ray. I'm glad you said it. There is a lot of mumbo jumbo around not based upon experience, which Taylor had plenty of in his time. Will | |||
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My! Aren't the good ol' boys infatuated with John Taylor! Taylor KO values are BS! My gosh! Sure, for the solid, a heavier bullet of faster velocity and greater caliber will be more likely to stagger jumbo with a noggin shot, than will the slower, lighter, smaller diameter bullet. You don't have to be a rocket scientist to figure that one out. That is all the TKO says. It is kind of common sense, eh? Let us just call a spade a spade. The TKO is mumbo jumbo, an old poacher's parlor game. Total BS of no practical use except for making more BS, and giving an old poacher something to write BS about. | |||
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DaggaRon, You sure get crabby working the night shift, don't you? And, hey, I have the title around here for being the crabby, critical, and cynical old man. The problem with any indice is that in the field things sometimes don't work as they are suppose to, whether it is Taylor's or whoever's. The effort to define it is valiant and worthwhile, but I will never see enough field experience to prove one better than another. And when you shoot a buff or elephant with the big gun and they don't even blink much less flinch, and give you that "FU" look, what does any indice really mean? Will | |||
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Will, forgive him, he has a acute case of assi-idas, a common desease among old hunters, it is when the nerves in the eye get crossed up with the nerves in the a$$ and that of course gives one a sh--ty outlook on life.... He's ticked cuz Taylor shot more and bigger elephant that he has, and never lacked fer wimmen in camp!! ![[Razz]](images/icons/tongue.gif){kind=icon} | |||
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Dagga, If you want an accurate killing formula, try the Atkinson formula, Use a postal scale to weigh the loaded round, the big dog sleeps on the poarch...no BS with this one. | |||
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quote:Wimmen? | |||
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Ho Ho Ho. The inconsistencies and unpredictability of the critter factor (too complex to model) is indeed what makes all "indices" just so much BS, the TKO included. | |||
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quote:Hey Ray - we call a similar illness here in Alaska "optirectititis" - same result, sh-ty view of life - very common in late December, early January - supposedly caused by the shortness of daylight during the winter - the only known cure is to go hunting somewhere far south of here (or fishing, works just as well) - KMule | |||
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Mick, Does your puzzlement refer the rumors about Pondoro's sexual orientation? How about Pondoro wandering around wearing only a turban and sandals on his Mozambique ivory poaching trips? Well, he must have been AC/DC, because Will claims to be the son of John Taylor and a native woman of Mozambique. Ray, as usual is murdering the English language, and KMuleinAk is doing no better. My view of the TKO is actually called "coprobovoscopy." I see it as BS. | |||
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D-Ron, Your one sick puppy! | |||
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Why, thank you Ray! You are right again! | |||
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quote:hey there doctor ron - it is a joke, in reference to what some call "cabin fever" - you lived in Alaska, yes? a joke, nothing more - good luck on your upcoming hunt KMule | |||
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The only area I hate people using taylors factors for is when drooling over the figures for the old bore rifles(10, 8,6, 4 etc.) In that the 10 bore has Tko's higher than a 577 nitro. And the 4 bore has a tko up to 400 depending on loads! The 600 nitro has a mere what, 155? Karl. | |||
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Karl, I suspect you are one of the few members who could handle a 4-Bore! I shouldered one years back and the weight alone put the fear of GOD in me! ![[Smile]](images/icons/smile.gif){kind=icon} | |||
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KMuleinAK, Thanks for the best wishes. No offense was taken. It is all in fun. Best wishes to you for good luck on the hunt. Cheers! | |||
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quote:Right. But a more interesting case -- because it fits actual rifles and bullets -- would be a comparison of, say, a 150 grain .264 projectile at 2800 f.p.s., with a 150 grain .30 caliber projectile at exactly the same velocity. Both would have exactly the same kinetic energy. Given the way Taylor calculates his KO factor, the .30 caliber projectile would have a higher number. But would it really knock-out or kill any better? Another example, based on existing rifles and bullets, would be 350 grain .375 bullet at 2400 f.p.s., versus a 350 grain .458 bullet at exactly the same velocity. Which is likely to give better penetration and knock-out? In both of my hypothetical cases, the smaller diameter bullet would have considerably higher sectional density than the larger diameter one. Yet Taylor does not take that into account, even though sectional density is a major factor in penetration. [ 05-02-2003, 18:53: Message edited by: LE270 ] | |||
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Bob, Wink when you say that! OK, at least remove your tongue from cheek and accept my congratulations for this excellent illustration of Taylor KO coprobovoscopy. Cheers! | |||
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quote:Yeah, but they say here that the Taylor formula works only with solids. So you're going to have to get some steel-jacketed lead-core baseballs for this. Maybe Woodleigh will make them for you if you order a sufficient quantity. [ 05-05-2003, 06:08: Message edited by: LE270 ] | |||
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LE270 Touche.Nick I draw a paralell to 'shotguns firing slugs'for the bore rifles.Good fun but do less damage than rifle bullets anyway. Karl. | |||
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quote:Can't argue with that, especially when weighing a .416 Rig and a .404 J. About the same, but one IS bigger than the other - no BS . | |||
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sd of about .300 mv of 2100 to 2600 minimum bore of .35... boom! jeffe | |||
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