RE: Gun no longer holds a group
My guess is that there is nothing wrong with your rifle. First clean it. I use Wipeout sit for 2 hours, patch til dry and clean.....the first patch should be dark blue which indicates copper build-up. Followed with Butch's Bore shine 20 scrubs with brush....patch til spotless. Re apply Wipeout for 1 hr and patches should be clean. Now put the old scope back on tighten everything and shoot it. If you are GTG then put the new scope back on and check the groups....If they are GTG you're a happy camper....if not, document your groups and send the sucker back for a new scope. If you have a wood stock, make sure nothing is binding anywhere. Some stocks can shift/warp with age. Good Luck, Rick.