User blog comment:Codfan/Inaccuracies?????/@comment-1079585-20100222170736

5.56mm - probably never killed anyone in one shot immediately unless it pierced the heart or skull.

Pistol rounds - Pretty much incapable of piercing any decent body armor beyond point blank range, and do almost nothing at long ranges even against unarmored targets.

There are plenty of other examples, but I asked Griever0311 (a Marine) to comment here when he gets the chance.