Brownells sells flex hones, 180 grit and 800 for barrel polishing. Thirty years ago I made a muzzle loading trap gun and did a jug choke with emery paper and split rod. It seemed to take forever. But that was with steel and a 6" section of barrel and .010 deep. I would never try that again. Glad I found out about Brownells.
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Paul Harm
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