You can find specialized paper reloading supplies at several online retailers, particularly for black powder shooting and paper cartridge making.
: Sells blank paper tubes in counts of 110 to 230 for calibers such as .50, .58, and .69.
: Stockists for CartridgeKits systems, specifically the 44-caliber Master Kit. Pre-Rolled Paper Tubes
For long-range target shooting or historical accuracy with lead bullets. Making Paper C&B Cartridges with the Crossen System
: Carries 10-sheet packages of 8.5" x 11" nitrated paper for $14.42, designed specifically for black powder cartridges to ensure complete combustion.
: Sells complete paper cartridge kits ($34.95–$64.95) and individual packs of paper cartridge rolling papers starting at $4.95.
If you are looking to make paper cartridges for black powder revolvers (like .36 or .44 caliber) or rifles (like the Sharps), these specialized shops offer everything from raw paper to complete forming kits.
: Offers pre-rolled paper cartridge tubes for .58 caliber at $22.00.