The bad part is, when you do need to pull a load or patch, it’s often when you’ve been shooting, hence there is powder residue in the barrel.
If you look at the pan after firing you can watch that residue (AKA fouling) suck moisture right out of the air within seconds and become damp even on a dry day, it’s a salt and it’s hygroscopic.
This is why you need to clean black powder firearms the same day.
It sure is a bad feeling when you really need to clean the bore but you can’t because of some obstruction, if you don’t have what you need on hand it can take days before you do.
It ain’t like WalMart or even gun stores carry CO2 devices or ball pullers.
I do not know if I was Taught Right but I was Taught to use a wet patch with cleaning solvent on it with every shot.
Dam not Soaked
It helps push all the crap down to the breach and cleans the barrel for the next ball to shoot.
I have never had a lot of Fouling Build Up after a shoot.