Butler
I've never done it, but I believe that the paper needs to be nitrated before you make cartridges of it. Otherwise you will get pieces of still burning paper out the barrel and probable pieces remaining in the cylinder as you go to reload! OOPS! I would guess ignition would be probablematic if the paper were not nitrated, too.
If the Shooters.com archives are still up, go there and do a search on nitrated paper and paper cartridges. I believe that there were several discussions there about making cartridges for rifles, and the same information would apply to pistols except size.
As to size, I would measure my powder column now, cut the paper to make one that size and still close. Roll the paper around a dowel the size of your chamber, twist one end, pull off the dowel, (wax the dowel well first) fill with powder and twist closed. Cut the twist as close as possible. Experiment with the paper, will a cap ignite and burn it? Then with powder and a wad, is ignition reliable or will you have to cut (bite) the cartridge begore loading?
Sounds like fun, I wish I had the time to do it. Let us know how it works out.