Bought a Ruger Blackhawk in .44mag. Shoots great. The cylinder seemed to bind up a couple of times after the 4th or 5th bullet was seated. The cylinder wouldn't move to the next round. Removed cylinder and bullets fell out. Couldn't see any raised metal or anything else to cause this binding. It shoots my reloads fine but binds on 2-3 different kinds of factory ammo. Any thoughts?