The FBI says that the average self-defense shooting is 2 rounds, if I recall correctly. That being said, I always have at LEAST 22 rounds of .45 on me. It would really suck to be in a situation where you need ammo and don't have enough. I know through my training scenarios in the military that my reaction to a close range threat popping up is an automatic 3 rounds in the chest. Given what I know about how I react under stress, I am already above that "average" after putting down the first dude. Hope that there aren't more and I decided to carry the "average" of 2 rounds...