Let me just add that mild bore pitting might be a problem for benchrest guns, but for the average rifle it' s probably not going to make much of a difference. I' ve got a Model 1891 Mauser and if you were to look down the bore of that rifle you would swear it wouldn' t be capable of shooting a 20 inch group at 50 yards. The bore looks awful, like rough sandpaper or something. But guess what, with iron sights it' ll put 5 shots in an inch or less at 50 yards almost every time. It just makes you wonder if we sometimes make too much of a deal over this barrel cleaning stuff.