Good info Rob, I enjoy revisiting this topic as it seems even after all these decades of shooting muzzle loading firearms, we sometime stumble across something we least expect to find.
For years now I seldom have swabbed between shots. In fact, I was surprised at this years Rendezvous that I didn't have to swab once in the progression of our 15 shots we had to take for our Men's shoot. Normally in the past I'd find myself swabbing after each 5 shot set, but not at this year's doings. Perhaps it was the humidity and a better grade of spit (thanks to the spirits Rondo and I was partaking of in the evenings,
) that helped out? Anyway, I shoot a tight patch and ball load which I do use a short starter.
Now with my pistol I use a small enough ball with a .017 ticking patch that I can thumb press. I like this way of loading.
My grandson shot pretty accurately (he's 7-3/4 years old) at the kids shoot this year and I backed his ball off from using a .440 to a .433 with a .017 spit patch along with 40 grains of powder. I thumb pressed his patch and ball into the bore with ease before ramming it home (which I allowed him to do - then I'd check it), and he ended up finishing 2nd on a tie-breaking 100 yard gong shot (which appeared to hit in the middle of the gong), so I've been slowly changing my thinking/approach to going with the thumb pressed patch and ball.
Perhaps I will do some testing with my main shoulder rifle - going with thumb pressed balls when loading and see what results I get. I'm all for eliminating a short starter step in the loading process, and the potential of swabbing even once in a fifteen shot set.
As far as my Buffalo X-Stick Rifles and Chunk Gun goes,,, I'll probably always swab between shots with these rifles, but we're talking a more controlled shooting/tight patch and ball environment -vs- line shooting with a bunch of friends just out enjoying the outdoors with some friendly shooting matches.