rickyp, tell us, what facts led you to this opinion? The .30 carbine round is moving along more than 300 fps faster than the 9mm in a carbine, and will defeat kevlar body armor. I own both .30 and 9mm, so don't try to tell me which is more powerfull. And as far as a .45 goes, whatever advantage you gain in close range knock down power, you lose at longer range. It is pretty useless past 100 yards. And any decent vest will stop .45's at point blank range.