If you don't mind having an oversize chamber then polishing may be successful. The only proper solution is to pull the barrel and set it back one turn, then carefully re-chamber with a good reamer. The cuts should be fairly short, withdrawing and cleaning the reamer and chamber and applying plenty of cutting oil between cuts. Rough chambers are the result of blunt or chipped reamers being using too fast and the swarf build-up on the reamer edge scores the chamber wall.
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