So I just purchased a Varney Carron helistop 16 gauge, and I put it through some paces yesterday. Maybe the 20th shell I pulled out of the barrel, I didn't take much notice of a little black spot on the primer, a piece of dirt... some unburnt powder.. whatever. Then 20 rounds later, another shell with a blackened primer. So I took a closer look and all I can deduce is that the firing pin is too long and the primer is splitting open allowing some form of "blowback" (im not really sure what to call it). I continued to shoot but when it happened a third time I called it quits. It happened in both barrels, with different shells each time.
Has anyone come across this or have any advice on what to do about it? can I just shorten the pins a few thousandths? or is it something that I shouldn't even worry about?
