By "types," I assume you mean different types of bullets--soft, mushy ones, hard, tough ones, etc. First, don't set your heart on minute-of-angle groups. You may get them, but you don't need them. An inch and a half will do fine. I'd say if you don't find something that will give you this kind of accuracy within three boxes, it's time for a trip to the gunsmith to see if your rifle is ailing.