More or less just looking for the round it likes best. Actually that it functions best w/. Had to run to the pistol range seeing as my favorite outdoor range is closed. 25yds was what I had to work with. Thankfully for the guy and his 44 mag drowning out my rapid fire. Man it felt good. It seems to like the Federal maroon and black box. Think Ill try some CCI Mini Mag seeing as I was told it was hotter. Im thinking this thing is going to bring me lots of pleasure.