I am using bore scrubber each time I clean it. Its suppose to be good for removing copper fouling. Pattern seems to be running first shot out after cleaning is well off target and then it is better for awhile until about 1 box of ammo. on the heat I am shooting groups with a barrel that is warm to the touch but I would not call it hot. Most of the time I am walking down to check the target in between groups (3 shots) but I have also fired 2-3 groups on occassion.