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The Range
Handgun Discussion
Army wants to dump the M9?
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<blockquote data-quote="Rod Snell" data-source="post: 2584986" data-attributes="member: 796"><p>Don't have any online links, but I ran across the study on handgun knockdown done by MGen Julian Hatcher, and he came to the conclusion that 100% knockdown from a single projectile traveling at 1911 .45 speeds would require a projectile <strong>3 inches </strong>in diameter. Julian Hatcher created the % probability "Hatcher Knockdown formula" which has been discussed and cussed for a century. There is also a Taylor formula: <a href="http://www.handloads.com/calc/quick.asp" target="_blank">http://www.handloads.com/calc/quick.asp</a></p><p></p><p>I also ran across an old memo issued to troops standing guard duty in the Phillipines during the uprising, which advised the soldiers carrying .30 caliber rifles NOT to shoot attackers in the chest, since "the bullets pass though the chest with fatal wounds that do not stop the attacker from completing his attack on the sentry." It advised shooting into the pelvis area so the rifle bullet would more reliably stop the attack.</p><p></p><p>MGen Hatcher was a great fan of machine guns producing multiple hits with large bullets, and established an Army machine gun school prior to WWI.</p><p></p><p>The pictures shown above of "Knockdown power" show mostly the unpredictable muscular reaction of a live animal being shot. MV=MV is a universal law, and is easily demonstrated using a ballistic pendulum or dead carcass. Any projectile imparts as much momentum to the gun as it takes with it; that is why artillery pieces are several orders of magnitude more massive than the projectile: to reduce recoil speed.</p><p> In fact, Mythbusters demonstrated the handgun knockdown myth on their popular TV show. They commented about the large number of "yes, but.." letters they got.</p></blockquote><p></p>
[QUOTE="Rod Snell, post: 2584986, member: 796"] Don't have any online links, but I ran across the study on handgun knockdown done by MGen Julian Hatcher, and he came to the conclusion that 100% knockdown from a single projectile traveling at 1911 .45 speeds would require a projectile [B]3 inches [/B]in diameter. Julian Hatcher created the % probability "Hatcher Knockdown formula" which has been discussed and cussed for a century. There is also a Taylor formula: [url]http://www.handloads.com/calc/quick.asp[/url] I also ran across an old memo issued to troops standing guard duty in the Phillipines during the uprising, which advised the soldiers carrying .30 caliber rifles NOT to shoot attackers in the chest, since "the bullets pass though the chest with fatal wounds that do not stop the attacker from completing his attack on the sentry." It advised shooting into the pelvis area so the rifle bullet would more reliably stop the attack. MGen Hatcher was a great fan of machine guns producing multiple hits with large bullets, and established an Army machine gun school prior to WWI. The pictures shown above of "Knockdown power" show mostly the unpredictable muscular reaction of a live animal being shot. MV=MV is a universal law, and is easily demonstrated using a ballistic pendulum or dead carcass. Any projectile imparts as much momentum to the gun as it takes with it; that is why artillery pieces are several orders of magnitude more massive than the projectile: to reduce recoil speed. In fact, Mythbusters demonstrated the handgun knockdown myth on their popular TV show. They commented about the large number of "yes, but.." letters they got. [/QUOTE]
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