I am selling a big selection of 54 bullets.
https://www.24hourcampfire.com/ubbt...00791/re-54-caliber-bullets#Post15300791

If you wanted to go the ball route, I would try 530, and a 0.020 or 0.018 patch. 70 or 80 grains of black powder. 3F is about 10% more speed than 2F. 2F seems to be more forgiving.