There is plently of information on the Shiloh Rifle forum and others on paper patching and this site will give a start:
http://www.public.iastate.edu/~jessie/PPB/PPB.htm Also, Venturino has a section on this in his book Shooting Buffalo Rifles
Do all the math before you order a mold!!! Make sure you have the correct brass (headspace) for your rifle. Buffalo arms may have some bullets you can try prior to ordering a mold. Bullet diameter, case wall thickness, and chamber dimensions will dictate what paper thickness (good paper is getting hard to find). But this can be overcome by ordering the correct diameter mold.
A chamber cast and bore measurements (slugging) is recommended to determine BORE and not Groove diameter although the latter is nice to know. There are so many variables from one 44-77 to another that it can be a money pit if you don't do some homework.
Worth the effort? Heck yes! Once you get your load worked out you'll realize how easy and convenient it is. Probably over 90% of the buffalo were shot with PPB and the 44-77 got a large share of them. Once you see that confetti fill the air you'll be hooked.
Likely, I'll never shoot another greaser through my 44-77. And the loads look sexy too!