Posted by KEH on March 11, 2015 at 06:01:29 from (67.231.175.190):
In Reply to: 223 ammo posted by jeffcat on March 10, 2015 at 19:41:39:
A bullet penetrates because of weight, velocity, and bullet construction, with velocity being the most important. I don't know how much material the .223 ammunition is supposed to penetrate, but here are some earlier figures: The Civil War muzzleloader, .58 caliber, was supposed to penetrate 12 inches of pine wood and it had a very heavy lead bullet fired at maybe 1200 feet per second. The 30-06 army cartridge, ball ammunition not armor piercing, was supposed to penetrate 1/2 inch of mild steel and was fired at about 2800 feet per second depending on which weight of bullet was used. There is army body armor that will withstand that, but it is heavy and involves use of a steel plate. The 30 caliber armor piercing bullet was supposed to penetrate 1/2 inch of armor plate.I don't know how much a military 223 is supposed to penetrate, but I doubt if it's more than this.
A cast lead bullet can be fired in .30 rifles at up to about 2000 feet per second with hunting accuracy. Faster than that an the accuracy falls off badly due to air friction melting the bullet. The lead bullet will penetrate at least 1/4 inch of steel at the faster velocities. Would this penetrate a bullet proof vest? Don't know and have no plans for experimenting due to costs of vest.
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