Imade a major mistake today loading my Pietta 1851 Navy. Got distracted and placed a Wonder Wad over an empty chamber. The cap went bang and the cylinder wouldn't turn. The ball was lodged half way into the forcing cone. Of course the loading lever was lined up with an empty chamber. Finally placed a screw driver to bridge the gap over the hole and pulled off the barrel. Got the ball out of the forcing cone with the edge of a sharp knife.
Be paying a lot more attention next time.