Yesterday I went to shoot my NAA 22 mag. Started with the lr conversion cylinder,.Shot a batch of shorts then went to shot some long rifles in it. The cylinder then locked up and wouldn't advance to the next station. Seems the spent cases were backing out enough and catching on the frame not allowing rotation. I had shot lr in it before and never experenced this before. Both loads were CCI. Later when I went to clean it I tried to load a fresh lr round in the cyl removed from the frame. This is the only way to load one of these little jewels. The round wouldn't seat fully in the chamber. Cleaned it and in she went like it should. My belief is that the shorts had leaded and fouled the chamber just enough so that when the lr fire formed the was enough interference to force the spent round back out,thus causing the before mentioned jam. Try it again soon and use only lr and see what happens. BTW I also have a 410 that chambers 21/2 and 3 in. Sometime the 3" will not eject. Cleaned the chamber and found debris problably left over from the 21/2" hanging the fired 3". I always clean after I shoot and many times I'll clean a clean gun watcing tv wishing I was out there getting them dirty.