The P-22's are notorious for not liking non-jacketed ammo. The lead builds up rather fast in the barrel and can cause another round to "explode" when contacting it. Since pressure can escape foward, there doesn't seem to be a the same reaction as a shot fired into a completely obstructed barrel. This would cause some of the 2nd shot to splatter you and not continue downrange. I would check the barrel fao any lead build-up and have a gunsmith check everything out before shooting it again.