I'm pretty religious about protecting the crown at the muzzle. I use the brass cone dealie if cleaning from the muzzle end, or I clean from the breech.
If cleaning after only a few shots for sight-in or after a kill, I just spray some WD 40 on a patch and run it through the bore. Maybe follow up with some gun oil sprayed on a patch and run it through before storage.
Periodically, or after a fair number of rounds, I'll use some copper-removing bore cleaner and/or a copper brush. Then, follow up to see if patches come out clean. Again, some oil before storage.
Guns that haven't been shot in a long time, and the number of rounds is unknown, I'd do the copper-remover thing. etc...
FWIW, my two pet rifles that I've had for over 35 years are still shooting inside one MOA.
Art
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