I sat down to reload some rounds for my 500 magnum, and I noticed a few anomalies on my primers while during my case inspection. I ran across two of these types of strikes, found it interesting, and dismissed it. As I got to thinking about what could possibly cause this, I found a few more and decided I should ask. Now, keep in mind there were 6 of these stikes out of 120 cases, so it certainly isn't happening frequently. However, any time a firing pin strikes a primer when it's that far out of time, especially on this gun, it could take your hand with it. I've been hand loading for years and I've never seen this before.
As you can see, I'm getting a double primer strike. I was trying to imagine how this could happen. Now, I load my 500 pretty stout. I bought it as an exhibition gun for the most part. Whenever I run into a friend who blows off any high powered pistol as unimpressive, I hand them my 500 with a 440gr loaded to 1650fps and humble them. The only thing I can think is it's possibly a bump fire/double fire situation. 500's are notorious for that. I had it happen the first time I fired one, but never with this pistol, and neither has anyone else that has fired it. However, The gun is frequently shot by other people not experienced with it, so it's possible during the discharge they are partially advancing the cylinder, but I wasn't aware the firing pin could make contact on a partial rotation. Anyone have some thoughts?