Just a suggestion, but before I tried fire-lapping, I'd use "J-B Bore Bright". It is also available from Brownells. A worn bronze brush is used with a patch wrapped around it. The Bore Bright is applied to the patch and then inserted from the chamber end. It'll be a tight fit in the bore. A total of 40 - 60 strokes are made. The results are about what you'd get from lapping. I'm completely sold on the stuff.
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