Right off the bat ......I would completely clean the barrel, I mean really work on it to remove all fouling of any kind, check the scope mounts/ring to be sure they are tight, snug the action screws, check the barrel channel/pressure point for wood contacting the barrel and let an experienced shooter shoot the rifle for groups. Yeah, I would try that before anything else. It wont cost you nothing but some time,elbow grease and some shells



doubleA