Shoot Like a Sniper: 10 Tips to Help Your Long-Range Shooting | Outdoor Life Number Two - Shoot Dirty. What do you guys think? I have always cleaned my (factory) rifle after every range session. I don't particularly enjoy cleaning, but it seemed that if I took 20 - 30 shots, my accuracy fell to hell, so I'd clean ('til the copper was gone). Now, if I have a custom rifle with a Bartlein barrel . . . what do you guys suggest for cleaning . . . every 20 rounds . . . every 200 rounds . . . somewhere in between . . . ? The Can O' Worms has been opened!!!