Celebrated Labor Day by taking my Pietta 1851 Colt Navy to a nearby range. I was using paper cartridges with 15 gr. fffg powder, a wonder wad and .375 swaged balls. The first shot and I couldn't advance the cylinder. Not a cap jam, I could still see the cap but extrude out from the space between the barrel and cylinder was shreds of paper. These are the same papers that came with the cartridge kit. I disassembled the barrel and removed a tube of paper that was going into the barrel. Whiskey Tango Foxtrot, my old technology pistol suffered from a high tech problem, a paper jam!
I see the need to experiment more with the cartridges to reduce the amount of paper. I've seen some of y'all using curler paper. Nitriding comes to mind also. I had several of these jams in the 15 rounds that I shot off today. Got home and found unburned paper in the cylinders.
In addition to that was one genuine cap jam. I am using Slix Shot nipples and Remington #11 caps (being very conservative with the caps I have remaining). So I guess I will have to work on that to get a more seamless experience with cap and ball pistols.