Thread: Hard CCI Primers

CCI were renowned for harder cups, and recommended for things like certain russian/chinese semi's where the firing pin floated in the bolt group and were known to pop the odd round off without the trigger being activated in semi auto mode. Probably not what happened here, but the harder cup thing just makes it much more apparent if there is another issue at play or a mechanical reason for a lighter primer strike. A good diagnosis tool, if you will...