[Unclenick]

I agree that's it. I've seen the phenomenon, too. I think it may depend on the anvil design as much as the decapping pin, as the problem tends to predominantly occur in association with a particular headstamp. CCI, for example, makes it's military hardness primers identical to its regular magnum primers except the anvil is differently shaped to reduce sensitivity. (Not that I've had any issue like this with CCI, but rather it's just an example of anvils not being identical, even within one brand.) I used to keep a small broken drill bit sticking in the end of a short length of 1/4" dowel for poking out the occasional primer that did this. Now I'm wondering what I did with it. I haven't needed it for awhile.