In Bowden's book, he talks about the same problem with 7.62x51 AP ammo through M60s.
When it's all said and done, people can be both surprisingly hard and surprisingly easy to kill, just depending. (That said, I agree on the issues with M855 -- problem I see with it is consistency, with way too much variation in terms of accuracy and lethality across lots due to the overly complex nature of the projectile.)
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