Hi . you may also want to try paper cartridges for the round ball as well . a paper cartridge that fits your bore can often give good results . I use a .735 rb. with artist news paper I get from staples over 75 grs. of 2f . I roll them in the pattern 76 style but glue them like a French cartridge they fit close as I can thumb them down the bore to start them. I also dip the ball end in a mix of 50/50 beeswax/olive oil to keep the fouling down . oh forgot to mention my Bess bore is .758 but I use the same cartridge style in my 1777 charleville get very good results. YMMV .