I shoot Hornady Critical Defense .22mag in my 1 1/8 NAA mini. Haven't checked with a chrono but supposed to use pistol powder vs. rifle powder so you get more powder burning in the smaller barrels. Ups velocity, and the bullet is supposed to expand very well from 2" barrels. Not sure about the smaller barrels like mine, but it has to be better than average .22 mag rifle ammo. Cases are nickel, so you can leave them in the cylinder day after day and less likely to corrode in there. I have no trouble thumbing the hammer on mine with the standard wood grips, but I've practiced. Great back up gun.