When shooting North South w/ the Sharps, I made paper/tube cartridges using both buffalo slug (for 50 yard) and conical (for 100 yard).
The load data is below.
Note the use of 4:1:1 Crisco/Alox/Beeswax for lube.
The results are below:
NOTE: the the heavy dipping of the cartridge/bullet end into lube -- 4X
You simply cannot
have too much lube in this rifle -- especially when repeatedly firing/shoving in another paper cartridge as fast as you can in a 2-minute drill.