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Old January 29, 2013, 11:31 PM   #20
chris in va
Senior Member
Join Date: December 26, 2004
Location: Louisville KY
Posts: 13,534
Just an uneducated guess...

The bolt rotates, right? I'm guessing the case is stationary while the bolt is rotating, causing the scuffs.

Perhaps it's a bit overgassed so the bolt is unlocking while the case is still 'glued' to the chamber.
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