I went to the range today with my new to me model 34 4"bbl. I didn't have time to clean it before I went. Tried different kinds of ammo. Liked CCI standard the best. However, every 50 or so rounds, the hammer would not go back to put the gun into single action and the trigger would not release. If I unloaded the gun and reloaded it, the issue resoled and I could go on shooting until it happened again. Could it be as simple as a dirty gun? Any advice appreciated. Thanks