Gunsmithing Brass marks

MWDG3

Sergeant
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Minuteman
May 7, 2006
346
14
Owasso, OK
Can some educate me as to what these rings and marks mean?

It's Federal 7.62 Match. Once fired.

308brass.jpg
 
Re: Brass marks

This is what I'm afraid of, thought I'd run it by you guys. Its a DPMS LR308 with a Howa heavy barrel. Very first trip to the range with the new barrel, first case stuck in the chamber and me without tools. Needless to say I wasn't thrilled. Stuck case was a surplus NATO intended as a fouler.

Second trip with tools and Federal NATO match cycled flawlessly. But the rings on the brass threw me. I still need to do more work grouping, but I will contact the gunsmith for his take. It was fun dinging 100yd steel offhand with a 12lbs AR.
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Next trip I try 300.