I need help. I consider myself a decent shooter but I'm having an issue with drift. I am shooting a 308 remington 700 in a bedded hs stock. And 6-24 vortex scope. Gun is more than capable of sub moa groups. But at 500 yards getting 8" of drift to the right. That's a 1.75 mil adjustment at 500 yards in drift with 0 wind. I have shot many times and not had this much bullet drift at 500. Iwas told by several that this can be caused by canting and or trigger pull. So I had 2 different shooter test today and all shot same to the right. If fact all shots combined maintained a 4" group at 500 with 3 different shooters. My group was 1.2" at this range. I can't figure out why i have so much drift?