My Sharps i just use loose powder. I dont need a shell casing. I could add paper patched rounds but its just too easy to drop in a lubed 475gr conical add 70 grs loose and close the breech. I found somewhat better ignition with a coarser powder.
But then im not shooting past 100 yds.
I haven't tried anything further.

Sure is fun to shoot.
Id like nothing more that smoke a bear with it.

JW