Re: Black Hills Match Brass Priming Question
The ring around the primer is a crimp. Depending on the year BHA military 5.56 match ammo is crimped. The first year it was issued it wasn't crimpped (02 I think), the second year it was. I don't know what year they changed the brass but the 08 issue ammo was WCC 07 head stamped instead of BHA MATCH. All of the BHA has been Winchester brass.
I don't know if the civilian ammo is crimped. You can either use a primer pocket ream to take off the crimp, get an attachment for your press to remove it, or get the Dillion deswager. The ream shaves of the crimp, the other two displace the crimp back into the case head.