I have a 2x7 redfield Trackerm scope that I bought in the early 70's. Its my favorite scope and its been on some big rifles. It spent a couple years on my Ruger No.1 416 Rem Mag. Never phased it a bit. I have had it on 338's and 7 Mags as well as my 700 Classic 300 Win Mag. There is no hurting that old scope. When you sight it in, it stays. Never had to rezero it unless I changed rifles or drastically changed loads.