When I got my first RSM, I had a Loopy that I mounted on it and it promptly died. Had it on an old 458WM for a while and the innards just gave way. Of course, I sent it back to Leupold's and promptly replaced it with a Burris. Tell you what, couldn't tell the diff between the two as to clarity. So far the Burris has held up from 375 H&H to 416 Rigby. May not ever scope the Lott, I just don't want it launch towards me with my luck.