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Old December 14, 2012, 11:08 AM   #6
Senior Member
Join Date: August 13, 2008
Location: California
Posts: 128
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.
Bore looks great
Doesn't a button displace the metel and not cut it ?
Today is my Best Day.
Lincoln, Ca.
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