My new Shilen select match barrel is shooting sub moa with factory ammo, and an inexperienced shooter! As far as breaking in I have not seen any signs of copper at all through the first 30 rounds. Maybe I dont know what to look for, but when I clean it all I get is some black powder residue. I have not seen any of the blue indicators on patches yet. I cleaned it after the first 5 shots, again after 5, and then after 10.