I was using Optilock 1 pc ringmounts on this particular rifle and there was no sign of movement and no change in POI after removing and reinstalling. Scope was a proven VX3 from another gun. If I had to guess I'd say sloppy chamber is the problem on this gun. Noticeable stretch above the web on fired cases and the fired cases don't even come close to chambering in other 270's. Neck sizing helped a bit.
I'm not saying all 85's are junk. I'm sure yours are accurate as you say they are. I just haven't had good luck with them. This is why I keep going back for more but I think I'm done after this one.
