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bullet energy limit
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<blockquote data-quote="birdiemc" data-source="post: 1788708" data-attributes="member: 29632"><p>I just did a quick search to see if there's documented force required to penetrate flesh...very quick search but I got 3 interesting results.</p><p>One from the Univeristy of Utah "The speed at which a projectile must travel to penetrate skin is 163 fps and to break bone is 213 fps" but they dont specify a particular bullet weight so those numbers could be deemed meaningless. </p><p>A stab wound only requires 10-20 newtons, so under 5 ftlbs</p><p>It takes 4000 newtons, roughly 900 ftlbs to break a human femur.</p><p>Again very quick and not conclusive web search, but interesting numbers.</p><p>I have no idea what round was fired in the example above, but can only assume it's going to be greater than 200gr, for that distance with retained velocity of 600fps at impact I would guess we're talking about a .50 maybe?</p><p>But using a 240 gr bullet, it would have 192 ftlbs at impact so by the numbers I found on the web, enough to penetrate skin easily, but not enough to bust up bones. So based on energy alone, that's a good shot at a terrorist, maybe not so good on something we dont want to risk just injuring and inducing lots of pain and suffering and perhaps a slow and painful long drawn out death.</p><p>But throw in the number 2400 newtons or 541 ftlbs that an amateur boxer packs in his punch, obviously without penetrating the skin, and maybe what folks are saying about pure KE not being enough for determining bullet effectiveness is true.</p></blockquote><p></p>
[QUOTE="birdiemc, post: 1788708, member: 29632"] I just did a quick search to see if there's documented force required to penetrate flesh...very quick search but I got 3 interesting results. One from the Univeristy of Utah "The speed at which a projectile must travel to penetrate skin is 163 fps and to break bone is 213 fps" but they dont specify a particular bullet weight so those numbers could be deemed meaningless. A stab wound only requires 10-20 newtons, so under 5 ftlbs It takes 4000 newtons, roughly 900 ftlbs to break a human femur. Again very quick and not conclusive web search, but interesting numbers. I have no idea what round was fired in the example above, but can only assume it's going to be greater than 200gr, for that distance with retained velocity of 600fps at impact I would guess we're talking about a .50 maybe? But using a 240 gr bullet, it would have 192 ftlbs at impact so by the numbers I found on the web, enough to penetrate skin easily, but not enough to bust up bones. So based on energy alone, that's a good shot at a terrorist, maybe not so good on something we dont want to risk just injuring and inducing lots of pain and suffering and perhaps a slow and painful long drawn out death. But throw in the number 2400 newtons or 541 ftlbs that an amateur boxer packs in his punch, obviously without penetrating the skin, and maybe what folks are saying about pure KE not being enough for determining bullet effectiveness is true. [/QUOTE]
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