Theory vs practice. It is one of few pistol rounds where bullet will tumble reliably, it is very flat shooting and has excellent penetration. For something firing bursts like SMG it is perfectly good round, better then .45 ACP which has rainbow trajectory and hence shorter effective range. I have some data about local SMG* hit probabilities at 25/50/100/150/200m range, will try to find them, but .45 ACP is clear loser of competition.     5 and 10 rounds burst used at 25 and 50m, 5 rounds burst a