Nice you guys really know a lot about guns and scope, I am in awe. GSA = guns scopes and ammo
Hopefully my Nikon encore on my S&W 500 lasts, I am shooting mainly Recoil reduced rounds, which are soft and easy for target practice. But I also shot some platinum tip winchester which are about the meanset I could find.
Also Bubba if you have scope ring alignment rods that would help too in checking that the scope is not getting twisted. Lapping will definitely help.
Also Bubba make sure the mounts are solid or this may happen, watch the attached video.
http://splodetv.com/video/500-magnum-scope-dome

Brian