This rifle has a little tighter bore than my 500 . That last group was shot without doing anything. They fit a little on the loose side but the gun seems not to mind . I shot a group right before that one with Emaxs that I knurled then sized back down . They also shot very well . Biggest thing with this gun was cleaning between shots. I cut my groups in half if I clean between shots my 500 is exactly the opposite. Also I can't let the barrel get to hot . Kinda crazy how guns like different things . I'm still learning .