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An one ever try using CLR on a bore to dissolve light rusting? Plug the muzzle,dump it in overnight and brush it the next day. Dang I am coming up with weird ideas today!!
Start with hot (not boiling as it causes flash rust) water and soap and a few strands of copper wool around a bore brush, dont put down soapy water. Dry it out, and then a medium weight oil and more copper wool.