When its all said and done, and WWlll is upon us, there will be 2 bullets to choose from. .45 and 9mm. Why? Because they are NATO rounds. Kind of like 5.56 and 7.62. Remington makes a subsonic home defense round in 9mm that is supposed to not shoot straight through, so as to do more damage. But I can't tell a difference through paper. Looking for someone to volunteer to stand im front of me to test the theory.