I went to the range yesterday to work on a good sub-sonic load that would cycle my AR.
While I was at it I shot a few of the 150 gr 1900fpc rounds I bought from cor-bon. Look how the brass was deformed and it even spit a couple of primers. I found that odd.
I settled on 11.4 gr 1680 over a 220 gr SMK.. It fed like a champ from my Magpul 20 round mag.
Below is a pic of a unfired cor-bon, a fired cor-bon and one of the cases with the missing primer. Look how the heads deformed on last picture..
K
