Nézd, én nem lőttem ezzel a lőszerrel emberre. Pláne nem úgy, hogy utána a célpontot tüzetesen vizsgálhattam volna. De kicsit utánajárva:
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Lethality
Recent combat experiences identified the green-tipped M855’s tendency to occasionally “ice-pick”-that is, poke completely through enemy personnel without neutralizing them-even with multiple hits, especially during close-range gunfights. Sometimes it performed well; sometimes it did not.
Army researchers found that lethality was dictated by the 5.56 mm bullet’s yaw; that is, after impact a hardened ball projectile must wobble or turn against its axis-yaw-or fragment, to inflict significant tissue damage. “At a low angle of yaw,” an Army study determined, “the bullet reacts more slowly, causing the inconsistent effects observed in the field … . [T]he location and amount of yaw depend upon the speed of the bullet at impact, angle of impact, and density of tissue.”
A related factor was the physiology of Afghan Taliban and Iraqi insurgents. Usually malnourished, their torsos are only about 7.5-inches thick, while the older M855 projectile often penetrated, “up to 7 inches before beginning to yaw, and will already have exited the body before yaw or fragmentation occur.” According to published standards, the new cartridge is designed to yaw no more than 3 inches beyond the impact point, producing a temporary cavity diameter of 4 to 6 inches and minimum penetration depth of 12 inches, and to do that consistently.
To test those standards, the Black Hills Ammunition ballistics lab assisted me by test-firing the M855A1 into ballistic gelatin. In particular, I was interested in the bullet’s performance at close-quarters so it was fired at 12 feet, a distance at which the old round sometimes failed. The results were impressive. In less than 1inch the lead-free bullet yawed, immediately opening a 4.5-inch wide temporary cavity, which extended for 14.5 inches-exactly as claimed. That would certainly be effective against the thin-torsoed insurgents operating in the Mideast and Southwest Asia.
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https://www.americanrifleman.org/ar...ng-the-army-s-m855a1-standard-ball-cartridge/
És:
http://gruntsandco.com/army-vs-marine-rifle-round-like-believe/