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Old November 5, 2012, 08:22 AM   #2
Senior Member
Join Date: February 28, 2008
Location: Michigan
Posts: 2,087
You did not say if the fired rounds were factory or reloads.

If they were reloads, the thin line at the base of the case indicates stretching of the brass. In other words the shoulder was bumped too far back when reloaded.

Factory loadings should not do that.
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