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Min amout of knockdown force at 700yrds?

 
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  #1  
Old 11-06-2009, 11:27 AM
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Min amout of knockdown force at 700yrds?

What is the min amount of force to kill a 200 -250lb deer at 700 yards quickly?
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  #2  
Old 11-06-2009, 03:48 PM
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Re: Min amout of knockdown force at 700yrds?

I'm not a big one to try and put numbers to something like that. I think it's an attempt to use mathematics on something that is really tough to quantify.

I've seen no difference in killing power on deer with any of several different cartridges. For instance the little .243 Win & 6mm Rem have caused instant death, same as far more powerful rifles... Instant death is pretty hard to trump. It doesn't get more instant when more power is applied.

Put a good quality expanding bullet into the heart and lungs, with enough velocity to initiate expansion, and you've got venison. They're pretty easy to kill. Very difficult to sustain life when the lungs are shredded and the heart perforated.

Then again, I haven't shot one at 700 yards yet.

I've read a lot of different theories about killing power, expressed in foot-lbs of energy for various size animals at various ranges... After seeing quite a few deer killed over the years, I'm not so sure the numerical theories make a lot of sense for determining "knockdown" or "killing" power. I'm also not sure "knockdown force" is a really good term. In simple physics, if your rifle generates enough force to knock down a deer, it's also going to knock you down when you shoot it... At least that's the way I remember my High School physics from about a million years ago!

FWIW, Guy
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Old 11-06-2009, 04:04 PM
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Re: Min amout of knockdown force at 700yrds?

I understand what you ae saying. I was just trying to find a baseline number for knockdown energy in order to humanely make a quick kill. I thought may 1000lbs of energy would be the min. Would you agree with this. Given we are using quality bullets.
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Old 11-06-2009, 04:30 PM
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Re: Min amout of knockdown force at 700yrds?

Regardless of range, the conventional wisdom says 1000lbs of energy to kill deer and 1500lbs for elk. All that energy means nothing with the wrong bullet or a poorly placed shot.
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Old 11-06-2009, 04:40 PM
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Re: Min amout of knockdown force at 700yrds?

Thanks that is kinda the number I was thinking would be min. If so then a 6.5x270wsm and a 270wsm should both be good for 700 yards given both retain 1000 lbs of KDP at that range.
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Old 11-07-2009, 07:49 PM
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Re: Min amout of knockdown force at 700yrds?

Quote:
Originally Posted by JWR07 View Post
Thanks that is kinda the number I was thinking would be min. If so then a 6.5x270wsm and a 270wsm should both be good for 700 yards given both retain 1000 lbs of KDP at that range.

Also make sure your bullet of choice retains the velocity needed for proper expansion. With some calibers itís the velocity that determines maximum range for a given animal.
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Old 11-08-2009, 01:46 AM
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Re: Min amout of knockdown force at 700yrds?

I decided to use a 270wsm with 140gr accubonds. Iam going to push it at 3150fps. Now given thevelocity and Nosler published BC (496) and using hanloads.com ballistic calculator I should have 1969fps and KDE of 1205 at 700 yards. I think that even though the numbers are just computer numbers this should be ok for whitetails out to 700yrds, boar out to 300yrds and bear (southeastern black) out to 150 to 200yrds.
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