I don't really follow a break in routine persay but I do the following for an off the shelf rifle/barrel. First clean the gun real good to remove the packing grease, run JB bore paste through the bore 100-200 passes to remove any burrs from the rifling process.Finally a lightoil and run a dry patch when I am ready to shoot.Then load her up and shoot, never letting the barrel get to hot. I then completely clean the bore at home, including copper removal but this I do everytime I shoot (except if verifing POI just before hunting).