I bought a new 7pin sidelock from Cabellas last year. When I first shot it , it would misfire on the top barrel. I sent it to the gunsmith Cabellsa requested and it came back in fine working order. I haven't shot it since last hunting season. Last sunday, in a sporting match, it started to do the misfire thing again. I was using new Fiokie ammo and the primers were steel. Could that have anything to do with it? Jim