A guy I work with carries a Walther SP22 for self defense. I asked him if he thought that wasn't too small. He said "no, a couple shots to the head will stop him." He was confident that he could do this. Me,personally if I'm having to deal with a very large aggressive threat,I'd want something bigger than a .22. Do you thinik he is being realistic in using a .22 for SD? I'm trying to convince him to get something bigger.and actuallly being able to hit someone in the head multiple times in a gunfight I would consider just plain luck.but that's just my opinion.