Spit. Great. Lovely. Comes up every time patch lube is brought up. Is it really a lube, or just a temporary setting agent?
While it may be great for a patched round ball that is to be shot right away, that is all it is good for.
Lube wads to use in a smoothie for shooting roundball or shot? No. Lube patches for hunting with patched roundball? No.
So? Well, part of what makes modern guns so appealing to people without our passion for these old guns and ways is accuracy, and the ease of achieving it. Which, is created by consistency, repeatability. The gun is always loaded the same regardless of intent. Shooting practice at the range is done with the same load as in the field. Why would one not do the same here? (Obviously doesn't matter if one only informally punches paper or bangs steel plates)
Keeping this away from the practical modern firearm arena that instilled this thinking in me. When I decide to take the responsibility of shooting at a living creature, deer, turkey, even just a squirrel, I want to know that the gun is going to do exactly what it has done every time I squeezed the trigger on the range. Or, as close as is possible. Why would I use one practice on the range and a different one when things really count?
(Joking (kind of)) do the spit patch guys pee in their barrels to clean them too? Lol.