breaking the rules or not- I don't know- but I enjoyed reading it just the same.
I don't think Taylor mentioned it, but he used a Rapine mould, .650" RB. Any time a lead sphere or bullet is shot from a gun, it needs to be lubed and lubed well with a lube that is proper for Black Powder. The mix of a fairly thick - beeswax and a bit of tallow, would allow the power gasses to atomize and blow a considerably amount of the lube off the ball's anterior surface, forward into the bore and grooves ahead of the ball for lubrication and fouling softening - this all makes sense of course, although a larger ball will shoot with better accuracy.
One method that is good for removing leading is "Kurly Kate" pot washing copper scrubbers. Cut a couple strands and pull them out of the Kurly Kate (or Curly Kate), then wrap them around an slightly undersized bored brush. You now have a 'brush' that removes leading like magic and will not damage any bore. With modern 4140 steels, I use 4-ought wool with Birchwood Casey's lead solvent in it. mostly, these days, I don't get any or much leading and what's there comes out on the cloth patch. this has to do with proper lubes and the right amount of same.
I guess I could take a picture, eh?