How to make a perfect fitting, TP paper wad to fit perfectly to the ball's base.
From 9 minutes on, Jeff from Taufledermaus explains the reason for the wads and how he made them. Good stuff & easy to make.
These wcould easily be used in conjunction with card of felt wads for proper column height.
Lyman Shotshell Loading Manuals give data for powder and wads for various shotshells. I am quite interested in trying these in my rifled barrel with .724" groove diameter) with either .704" or the perhaps even the larger .724" balls. Those, I might roll in bullet lube.

https://www.youtube.com/watch?v=mClz8nMLvyw&ab_channel=TAOFLEDERMAUS