I have a good copy of the .55 Pritchett bullet that I am using in the paper cartridges I use in my Enfields. The cartridge is the key is it was a paper patched bullet you could fire far more shots without your rifle fouling, such as what happens with the minnie bullet. If you are really interested have a look at the british military forums, lots of us posting what we are doing with pritchett bullets .

cheers

Heelerau