Industrial strength ammonia (9%) works really well. Do not let it set in the bore for over 5 minutes. I have been cleaning rifles with that for a long time to rid barrels of copper and have never had a problem with pitting or etching. Thing is now I seldom have to use it. The early tendency of my rifles to copper foul has been essentially shot out and I seldom have a problem any more.

There was no greater freedom than when I would leave Holiday Park Fish Camp heading my airboat west toward the Big Cypress. Fuel for 4 days, a good machete, an ice chest. No phone, no radio. Just God and me and the Everglades.