IIRC a paper patch boolit mould is generally not the same as a conventional boolit mould. Fascinating bit of boolit history. Rooster Jacket lube is marketed as a PP adhesive lube as well as a boolit lube. Old black powder cartridge rifles often used pp boolits, as you may know. PP boolits is a fascinating topic.
Tons of good info over on castboolits.gunloads.com
One thread on BP, another on other types of powders.