Looking at the primer shows that it is a reload. If he had just shot a double, it's quite possible he didn't hear the shot to hear if there was any "strange noise", so there could have been a wad stuck in his barrel. He didn't know for sure if there was an obstruction because he didn't check his barrels after he shot. Bad mistake on his part. He also mentioned that he had just replaced the triggers, so he, (or someone) could have goofed something up causing the gun to double. Hundreds of thousands of rounds through a Perazzi isn't that much if he takes care of the gun. On the other hand, I have been lamblasted on here before for saying so, but I never cared that much for them or the steel they use. But that's an awful lot of distruction for a double charge. Even for a Perazzi. I'd guess he had an obstruction.