Thread: What happened here?

Rem 7 1/2 Benchrest primers are excellent. On a par with CCI BR in my 223 for accuracy and low ES. Fed GM (SR Match) are not as good as the REM or CCI.

The only feature with the 7 1/2s is they are quite "fat" compared to say Fed SR Match.
So if primer pockets are shallow the Rems could end up sitting proud, or end up getting crushed by over zealous handloaders.
Essentially primers and primer pockets should align with SAAMI specs. So if you have a primer pocket that is shallow end of the spec and a primer that is at the fatter end of the spec there may be potential for proud primers.