Thread: question about marks on fired brass?
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Old June 3, 2019, 12:12 PM   #8
RC20
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Join Date: April 10, 2008
Location: Alaska
Posts: 7,014
You may have a thread of cotton in the chamber from an unraveled cleaning patch. .

I have had that happen a few times.

other marks don't usually do S shape - treads will
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