Contrary to what have said. Paper cartridges were used with both minnie balls and round ball. And the round ball were not patched. They also use cartridges for buck and ball. The paper was not to be placed in the barrel, since the ball was in a seperate section of the cartridge. step you loaded in 9 steps per the manuals.
1-load
2-Handle cartridge
3-tear cartridge
4-charge cartridge
5-draw rammer
6-ram cartridge
7-return rammer
8-prime
9-shoulder
and from this is ready, aim, fire.
Step3- tearing cartridge is the prepatory for pouring the powder down the bore in step 4. And to disengage the ball from the cartridge to drop/insert the balldown the bore.steps 5,6,7, are for nserting ramming and withdrawing the rammer. No-where in the manual does it say insert paper. And notice the manual says ball(doesn't define wether minnie or round). This is the proceedure used by both sides for loading th weapon. Wether you use Hardy, Casey, or any other manual.
I took this information directly from "HANDY-BOOK FOR THE U.S. SOLDIER"
Title page is a longy.
THE HANDY-BOOK
for the U.S. SOLDIER,
on coming into service,
containing
A COMPLETE SYSTEM OF INSTRUCTION IN THE SCHOOL OF THE SOLDIER.
with a preliminary explanation of the FORMATION OF A BATTALION ON PARADE, THE POSITION OF THE OFFICERS, &c.&c.
Being a first book or introduction to the Authorized-U.S. Infantry Tactics
Philadelphia:
J.B. Lippincott & Co. 1961
pages 32-35.
Now to answer the question the original poster asked!
What comes closets to period paaper used in cartrides is the 3M unbleached painters paper what you buy in places like Home Depot, Menard, Lowes and paint stores. The kind you use to tape off edges, trip , and windows. comes in rolls and is only about 4 inches wide.
But what I found that makes a good paper cartridge is you go to your local discount store like Family Dollar, Dollar General and buy those pads of paper for kids to use for drawing or dodleing. The pad I have in front of me is 60 pages of 9"x12" unbleached paper. cost me a buck I think. You can usually get about 300 or more sheets used for cartriges(usually a years worth of reenacting). I make myself a form and cut around it with a utility knife. I have been reenacting and making my own cartridges since 2000. And never have been questioned by the stitch counters. Then follow the directions that you can get on utube, or other places.
Good Luck.