I just got a Seekins 6mm ARC with the same goal in mind. What scope did you go with and why? I'm still trying to decide on that.6mm arc. I just loaded up some 87gr Vmax at 3040fps 31gr leverevolution at 70° from a 22" barrel. Shoots 1/2moa from an ar15. Fast follow up shots, low recoil, cheap ammo and components, and none of the bogus magazine problems with many of the cartridges mentioned above. Many of them are a nightmare when loading a mag beyond 5 rds. That is not the case here..... no pun intended..
Also, a barrel life longer than almost everything suggested here combined. Reasonably 4k rounds+.