I'm asking this to those who have already received their rifle. Are you doing any kind of break in before trying to determine what ammo performs best? I'm asking because on rimfire barrels that are custom cut, I wonder if anyone has noticed POI change after certain number of rounds down the tube. Also the idea of picking a favorite ammo for the gun say after 200 rds and buying a case only to see accuracy changes after 1000+ rds. Any info or experience appreciated.