Hello Just4fun63
Since my Sharps had the beech and beech block modified it uses Charlie Hahn pre made tubes. All that is needed is to cut and glue in the base paper, fill with powder, glue in a bullet and shoot.
That, however, does not answer your question.
If you will search "making paper cartridges for the Sharps rifle" there are several souces. such as Eas Gone with Mark Hubbs, MannyCA, Capandball, or Mike Beliveau (Duelist 1954) all have good information. so pick one you like.
My tubes are not nitrated and occasionally a piece of the tube remains. Mr. Hahn said to just load up another round and shoot it out.
My advise is to make tubes, which is a bit more labor intensive , but make a more consistent round rather than cutting off the tail. of a "period correct" paper dartridge. The tube is a bit more durable and once the sweet spot load is achieved makes a consistent load. easy to maintain
This is all from memory because when I moved my whole file of information did not survive. All I have now is a bunch of half finished cartridges waiting to be completed shot. More on that later.
As I shoot and develop more information it is an intention to post and share what I learn.
Hold center,
Bunk