I've always wanted a derringer pistol. I already have a couple pocket pistols and guns I carry, but I think they are cool. I want one of the classic looking ones, double barrel, no trigger guard, short barrel... My question is, what caliber do I get? Obviously it's not going to be for targets, but if I had to use it at 5-10', I'd like it to have a little stopping power, so .22 is out. I also want to be able to hold onto it, so I don't want a .44 mag or something like that (I do, actually). I'm leaning towards .38 Special. What's the best caliber for a close quarters, two shot derringer?