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Elementary physics says that "knock-down power" is a misnomer. If a bullet emerging from a cartridge were "powerful" enough to "knock down" a deer, it would "knock down" the human (who likely weighs more than the deer) behind the "bullet launcher".

If a bullet hits the CNS system of a deer, it will drop instantly, but it will not be "knocked down".

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I cant even begin to tell you how many times I have read that in some magazine, and all I can say is !!!!!!!!!

That doe I shot through both front shoulders with my 444 did a complete sidways flip upon impact!!! I would say 100% without question that would qualify as a knockdown and not some sort of trick that deer knew!!

I once believed that same statement that you made untill I actually saw it with my own eyes!!

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Well, you have a right to your opinion, just as I do. I prefer to put my faith in the empirically proven laws of Sir Isaac Newton.

I would suggest that you put a 150 lb sack of potatoes, or something of that weight, on a saw horse, and shoot it with whatever caliber you like and see if it knocks it over.

Now if you move the legs of the sawhorse very close together, putting the sack of whatever in a state of "unstable equilibrium", then even a very small force can knock it over. But IMO, unless the deer happened to be hit at the instant that it was in an unstable position, and the bullet hit the CNS, rendering it unable to adjust itself, then knocking it over would be highly unlikely.

But then, that's my hypothesis... and you have yours...

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I wish that doe was still alive and we could ask her what caused her to flip over sideways!

Like I said before, I once belived it could not happen either untill I actually saw it with my own eyes!!

Issac Newton says it cant happen, but my 444 Marlin says it can!!!!

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When deer or any other animal is “knocked down” the bullet does not physically make them fall it’s their reaction to getting hit that knocks them down. Unless the hit is to the
Central nervous system.

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When deer or any other animal is “knocked down” the bullet does not physically make them fall it’s their reaction to getting hit that knocks them down. Unless the hit is to the
Central nervous system.

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I may have misunderstood this response, but I still have to ask... Why???
If a bullet coming at 2000 ft lbs hits an unsuspecting deer and does not pass through, all 2000 ft. lbs of energy is transferred to the deer. Why couldn't the energy transferred literally knock the animal down and kill as a result?

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My hot rodded 22-250 with barnes 53 grains-x bullet! at 3700 f.p.s. any deer or hog i shoot here in texas, it looks like a grenade went off inside them!!!!! losses-none! zero recoil=perfect shots!!!! with a preminum bullet speed kills!

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My hot rodded 22-250 with barnes 53 grains-x bullet! at 3700 f.p.s. any deer or hog i shoot here in texas, it looks like a grenade went off inside them!!!!! losses-none! zero recoil=perfect shots!!!! with a preminum bullet speed kills!

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would you mind making me some of those rounds?

the problem with most .22-250 shells is they bullets are too soft

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When deer or any other animal is “knocked down” the bullet does not physically make them fall it’s their reaction to getting hit that knocks them down. Unless the hit is to the
Central nervous system.

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I may have misunderstood this response, but I still have to ask... Why???
If a bullet coming at 2000 ft lbs hits an unsuspecting deer and does not pass through, all 2000 ft. lbs of energy is transferred to the deer. Why couldn't the energy transferred literally knock the animal down and kill as a result?

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fowlplayr:

For the same reason that when that same bullet was launched from a rifle (at an even higer velocity) it didn't knock over the shooter.

The energy of a bullet is a function of its weight and its velocity, squared. Much of the energy of a bullet, when it enters an animal is consumed in destroying tissue, expansion, and heat.

Whether a bullet can "knock over" an animal is determined by the law of conservation of momentum...that is the momentum before the impact is the same as after the impact. Momentum is different from energy..it's the mass times the velocity (not velocity squared)

The momentum of a 150gr 30/06 bullet is only slightly more than a 90mph fastball...not enough to knock a batter over, but enough to put him on the ground. If the "ball" were smaller and moving faster and hence broke the skin and destroyed the heart/lungs, it would perhaps kill him....but it still would not be enough to "knock him over".

Difference is kinetic enery versus momentum.

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I have been trying to understand this subject for years, and this is probably the best damn explanation that I have ever heard on this subject.... Finally someone that can speak East Texas layman.

JJH - we should go drink beer and philosphize!