For wadcutters keep the speed under 700fps, domes can go the full velocity, it's just a matter of finding what your rifle likes, have an RWS 48 in .22 and still haven't found the best pellet, only can get 1/2 inch at 50 yards off hand so......
did you weigh the ones you have? mine where very consistent in weight(13.7-13.9) and most fit kinda snug in the breech. there were a few that were alittle sloppy but still make it go ting which made me happy