While I won't dare make the argument that 5.56 is better than 7.62... it just aint. I will say that I've seen quiet a few men done in by 5.56 and they were dead as a hammer from the get go.
I've seen nasty things with 5.56. It's really a weird round. It'll do stupid things like enter straight on in your abdomen around your belly button, but come out darn close to your shoulder blade. Most exit wounds I've seen with xm855 were keyholed and obviously larger than the entrance wound.
At any rate, I'm not saying this because I'm trying to say it's better than 7.62. I do think it's more effective than many people realize.
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