Spit patches are fine for plinking, when you intend to fire the gun within a few minutes of loading it.
I made the mistake of using a spit patch when hunting deer with my rifle, one year, and found a RUST ring where the patch was against the bore when I cleaned the gun that night. I had not fired the gun all day, and that patch had dried out during the day, leaving the rust. Since that day, when I spent another hour with a bore brush, and 4-0 Steel wool polishing that rust spot out of the barrel, I have used either an oiled patch, or a patch lubed with an oil/wax based lube.
You might want to avoid making my mistake on your own. The oil/wax lube is a vegetable oil lube- DO NOT USE any Petroleum Oils in your bore if you are shooting BLACK POWDER. Petroleum Based oils and Black Powder do not mix. The powder does not get hot enough, LONG ENOUGH, to completely burn out the Petroleum based oil, leaving with you with burned oil/carbon gunk in the barrel that glues to the barrel like Epoxy. It can be dissolved with alcohol, but its a royal PITA to clean that barrel.
The only exception I would make to using only Vegetable based oils in your Barrel( fine PB oils can be used in oiling the moving parts of your lock) would be mineral oil, or Ballistol, which is a refined Mineral Oil with some additives to neutralize Mercury of Fulminate, the very old Priming compound used in Early modern rifle Primers at the turn of the 20 th century, and on up through WWII( ended 1945). The additives do nothing for BLACK POWDER residue, but Ballistol is a good oil to use for a patch lube. :hmm: :thumbsup: