Jim, I have seen one pierced primer incident, without ill effects at all. It was a semi auto of some type, don't recall. It did nothing.
The idea is that the firing pin ( or Parker hammer nose) pierces the primer because the primer is not seated deep enough or the strike is too deep. The primer ignites but because there is a hole through it, gunpowder gases backflow through the primer hole and into the gun. Within the confined space of the action body, the gases can fracture the wood joining and or escape through the trigger slots, so the concern goes.
I have never seen this happen but I am aware that the gun club experts say that it can.
I wonder if anybody here has seen this happen with bad results? Again, it must be infrequent because the manufacturers do not put the grooves in . There are a few vintgage guns with gas grooves but I've forgotten which makers.
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