:yeah: I can't tell you how many people I've seen just run a dry patch through the bore before shooting,and thinking they have removed all the rust protection,oil BB,or whatever. Then they wonder why they get a build up? A dry patch won't cut it! You have to remove ALL the trace elements. I've used hot water,many times,only to go back and use a good solvent,and a brush and get more out of the bore. Any time you shoot a projectile down the bore of ANY gun,you leave some of that projectile behind! In a high power rifle it's copper from the bullet jacket,with a sabot it's plastic from the sabot,and with lead it's lead from the bullet. Leaving anything in the bore,only compounds the problem.