I searched the forum and got a lot of hits on this subject...so many that my head is spinning. Looking for a fairly simple (if there is such a thing) cleaning method that works. So the setup: I do not have a borescope or means to get one, I shoot my rifles dirty. Usually only clean them when the barrel tells me to or for storage. My RPR runs about 300-400 rounds before the groups open. I dont recall the exact method I used to clean last time, think I just used Hoppes copper and powder solvent and maybe a brass brush. Im not a benchrest guy, more of a plinking, hunting, prs.