The .223 isn't a good manstopper?
I remember about a year and a half ago we had a couple of islamic terrorists on our soil shooting civilians. DC snipers ring a bell? Just about everyone the shot died, the ones who didn't die were severely wounded. All of the victims were shot once with a .223.

Darn near every country in the world that has used a 6.5 mm military cartridge has abandoned it. the japanese and the Italians found that it wasn't a very good stopper because it was much too stabile and didn't create big wounds. The .223 works because the bullet tumbles when it hits flesh and tears a big jagged hole through a carcass. The 7.62x39 is even better- makes me wonder why they didn't simply adopt this cartridge instead.