I know in Erich's he has some good figures and I would copy them, then go to North American Arms.com and look at all their data on 22 rounds. They make a lot of 22 and there is a page with such info. Personally, I like Stinger ammo, basically a good hollow point. I currenty just use 22 for Ruger rifles, but I used to have a 22 NAA revolver.