Thread: what is this??
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Old January 30, 2013, 11:12 PM   #2
chris in va
Senior Member
Join Date: December 26, 2004
Location: Louisville KY
Posts: 13,534
Doing a bit of Google-fu...

Seems to be Russian manufacture Golden Bear. Steel case.

From another board...

Known on Russian .308 Win and .30-06 steel cased ammunition. The official answer is that it is to prevent the steel cases from sticking in the chamber. A technical explanation of how the groove accomplishes this is still unknown. I've seen fired cases where the groove has been completely blown out and no longer visible to completely un-changed. We fired some of this in an M-1 rifle and found it to be incompatible. Very violent extraction and a huge fireball. Not loaded with a powder compatible with the M-1.
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