I would be grateful for some clarification. For the same bullet, velocity and, to be quite sure, twist - which must surely mean the same external ballistics - if rifle A groups tighter than rifle B at 100,200,300... yards, then I am puzzled as to how rifle B can then become superior at longer range. As far as I know, bullets have no memory. So 500 yards downrange the bullet does not "know" which rifle it was fired from. All it "knows" is the external ballistic situation at the moment.