I was loading a batch of mixed brass and I had 4 cases split while seating the bullets. All the same headstamp. So I pulled all the bullets with that headstamp. I decided just to fire the primers. I ran the cases through the crimping die and they drop in the cylinder just fine. But.. when I fire one it locks the gun up. Can not cock it for the next shot. Have to take the cylinder out. What is going on? Should one be able to do this? I have certainly seen it recommended as a way to get rid of a few primers. Gun is a Ruger Blackhawk.