Have not done the Sharps thingy, but DO make paper cartridges for some of my charcoal burners. I use JOB Double-Wider rolling papers (which DO get me some strange looks at the local mini-mart, since the owner knows me and my background!)
Lube- yeah, with BP, you are gonna need it. Helps keep BP fouling somewhat controlled. Bore Butter will (I think) be a bit too sloppy- I use Crisco for my .50 Maxis- in the forward grease grooves. I save the rearmost grease groove for attachment of the paper tube. I roll the papers onto a dowel just a hair bigger than the bullet, slide off the dowel, let dry, then slip over base of bullet, and tie it with a single strand of COTTON thread. Synthetics are a bad idea. Measure powder, pour into tube, fold excess, glue down (drop of mucillage or flour/water) let dry. Mine are front loaders- tear or bite paper, pour powder down, insert bullet paper and all, ram home. DO be aware of potential for smoldering bit of paper if reloading in a rush.