My buddy is going on a hunt in Utah on private property. The land owner told him most shots are 300 yards due to flat open terrain. He has a cow tag and currently shoots a 30.06. 180 grain core loct. Would you go down to 165 grain for a flatter shot? Also what ammo brand you would you recommend? He needs to start sighting in the new rounds now to be prepared for January. Thanks for the help guys. Hope this isn't a thread that's been beaten to death. Didn't see any on here.