I have a Tikka T3 lite witha Leupold VX3, 3.5-10-40. I have a DNZ mount on it. I want to set it up for long range, and think I need an MOA mount to keep the reticle more to center. All I have found it the EGW 20 moa. Is that too much for out to 500 yds? I was thinking 10 moa, but have not found one yet Thoughts? (165gr at about 3000 fps) I shoot my Ar at 600 yds with iron sights for competition.