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Old May 16, 2012, 06:38 PM   #6
Senior Member
Join Date: May 4, 2001
Posts: 7,042
Have you considered that the spot may be corrosion, not fouling.

A good way to clean a badly fouled bore is to buy a jar of JB Bore Paste from Brownell's.
This is a special non-embedding super fine abrasive used by benchrest shooters to deep clean bores. This will remove anything in there that can be removed, and will not harm the bore.
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