John: The problem with using a spit patch to clean after a shot out of a smoothbore is TOO MUCH SPIT. And, if you run the jag all the way to the breech, you are shoving wet GOO into the flash channel, or vent.
I stop an inch short- I have marked my rods--- of the plug, and then pull the jag and patch out. The goo is very damp, and very noticeable. Then, I either flip the patch over, or use a new patch to go down and catch the remaining residue, but this patch is mare wiped across my dry tongue. ie., its not very damp at all. Then I run a dry patch down the barrel before pouring in the powder.
I learned to do this with my Percussion shotgun, after having several misfires on a very hot, humid, July Day. When I pulled the nipple, Finally!, and checked the flash channel with a pipe cleaning, it was full of GOO! Once I cleaned that out, and then cleaned the back of the barrel with a dry patch, and fired a couple of caps just to make sure the channel was open to the barrel, The next load fired just fine.
I had been told that the cap would burn and push the goo out of the flash channel. Someone didn't tell that to the flash channel, however! :cursing:
I don't expect that much from my caps anymore, although its amazing how much flame comes out a muzzle when just a cap is fired. My own theory about why the cap will not clear the flash channel is based on observation that the material is damp goo- the consistence of Cold Cream, and that the orifice at the bottom of the nipple creates a very small stream of flame that just does not expand enough to create the pressure needed to blow this stuff out. Now, if the goo was dried crud, that might be different.At least the cap would burn a small hole through the dried crud, and might, Eventually, burn up most of the crud. But, I think an old nipple, where I drilled out the orifice to make a much larger hole will be required to "BLOW" out goo and crud from the flash channel into and through the barrel. I am still not convinced that damp goo will move out of the flash channel, as there really is not enough compression created by that fired cap.