The Semi-Auto ramp up is currently .25>>.380>>.45ACP.
Don't cheap out....
22lr>.25>.380>9mm>.40>.45>10mm>.44Mag Desert Eagle>.50SW Desert Eagle
BTW: .380 mouse/pocket guns like a Taurus are horribly uncomfy to shoot, don't put a newbie on one. And I think you find .38 in a decent size frame revolver shoots about the same as a 9mm... it's an old blackpowder cartridge and loaded pretty tame until you get to the +P.