Originally Posted by Sakoluvr
I thought this was a good article that may be of some help if you haven't seen it before.

https://www.gunsandammo.com/editorial/the-truth-about-primer-misfires/247980

The most common general cause of misfires is what's termed "insufficient indent." That means the primer was not struck with sufficient force. You say, "Look at the indent. It was huge. I even hit it several times, and it still didn't go." Primers are set up with a very precise orientation of primer component parts. If the primer is hit once and it does not go off due to insufficient firing-pin force, the sensitivity is further decreased. The primer mix, called a pellet, may have been cracked and moved out of the way from between the cup and the anvil. The primer mix is intended to detonate when sheared between the cup and the anvil by the primer strike. If the first blow is insufficient, the second one is now trying to ignite a primer that was damaged by the first strike. Sometimes the primer will go with a follow-up hit, and sometimes it won't.


That is good information, thank you.