I too am a new flintlock shooter, bought a pedersoli pennsylvania rifle 2 months ago. First time on the range, i dry pattched the barrel to remove any manufacturing oils, loaded a .490 ball/ .010 patch and fired. On the next reload i couldnt hardle get the ball down so i began swabbing between shots. This kept it going til shot number 8 where the ball stuck 5" from the muzzle while loading. Tried to pull it with a ball puller only to snap it off, ended up having to grease gun the ball out.
I noticed after getting it cleanbthat the barrel appeared to have patches of anticorrosive or some such in it that try as i might i couldnt scrub out. Now with about 50 shots through it, all the factory anticorrosive has been shot out leaving a bright shiny bore that loads easily shot after shot. I am currently running .480" balls with .020" patching on top of 65gr of 3f goex. Getting 2"-3" 5 shot groups offhand at 25 yards.
Chris