I'm having a hard time keeping groups beyond 150 yards. It's a Trophy Hunter Package 30-06 that I added on a Hoque over molded stock and one piece DNZ Game Reaper mount for the Nikon scope.

I've tried Fed. Fusion and Hornady Superperformance GMX both 165gr. Both took about three rounds before settling into good 1 moa groups at 100 yds. Once I started trying to confirm the Spot on hold overs it all went to crap. I couldn't group good enough to even verify the hold overs.
I used to shoot M24 and SR 25's at work for quite a while. I feel like my position is stable.
While shooting this gun I really didn't think about putting any significant time between shots. With the light barrel I wondering if this could be part of the issue. I also wonder if I should try another load. I have a week before my first tag so I'm feeling the pressure.

Any help is greatly appreciated.

Andy