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Old December 14, 2012, 10:39 AM   #5
4V50 Gary
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Join Date: November 2, 1998
Location: Colorado
Posts: 16,207
I've been thinking about it and it comes from the inside. It looks like it was the barrel maker who made that ring. I suspect that the barrel was rifled by a button instead of a single tooth cutter. The button is a cutting die that is pulled through the bore.

Hold the bore up to the light and see if the bore is clear. Look for lumps.
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