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Old May 5, 2013, 07:19 AM   #3
dahermit
Senior Member
 
Join Date: October 28, 2006
Location: South Central Michigan...near
Posts: 6,501
It is corrosion on the brass. Fine steel wool will remove the corrosion and allow you to see the pit that will be beneath it. I have often removed such corrosion, and then worked down the brass to the pit with en emory board to see how deep into the case-wall it was. Most of the time the pit is not deep enough to be a concern. From your picture, I think that if you remove the corrosion the pit will be shallow-ok to use and shoot.
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