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Old January 11, 2013, 04:30 PM   #22
Senior Member
Join Date: December 14, 2004
Location: Maine
Posts: 3,321
I agree that, unless fired brass is deformed, leave the chamber alone or send the rifle back to the factory for service.

If brass is slightly deformed by the scratches, I'd take a fired case, modify the base so it will take a screwdriver shaft chucked in a drill, coat the case with Flitz or JB Bore Paste, then rotate it slowly in the chamber with light force. Such polishing shouldn't be so aggressive as to change chamber dimensions.

In an older rifle whose chamber has rusted, a brass brush with 000 steel wool on a cleaning rod, turned by a drill works well. Too little polishing is better than too much!
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