Follow up on my issue... Thanks for everyones help....I removed and replaced each component to systematically investigate the issue. It seems the culprit was a misaligned screw tap hole (the second one from the muzzle). I installed some Burris XTR rings and visually borescoped the rifle and scope. Borescoping indicates a 2.8 mil correction. So far, it seems to have corrected my issue. I'll know more when I zero.