Thundermaker
If you were to ask my opinion I would tell you to read on this forum and the historic shooting forum distantthunder's (Jim Kluskins) posts detailing dual diameter paper patch bullets. The chamber/throat relationship you are likely to find in that Pedersoli would lend it self very well to that style of bullet. I would also suggest you check out threads in the paper patch forum and look at the bore pigs many of us are using to wipe with. Also a delrin rod to push the pigs through.
There are many paths to get to where you want to go but this would be my suggestion as a good starting place.
My son Daniel and I have been shooting paper patch 45-70 exclusively in matches for several years with great results. Where they really shine is when the wind kicks up.
Todd