Welcome.
You will also want to take a look at out sister site Modern Muzzleloading Muzzleloading Forum which might have information for you on reloading black powder shells. However, I think The High Road forum may be a better bet. We don't discuss breech loading firearms even if the cartridge or shell was black powder, unless the ignition was from an external cap AND the gun was circa 1865 or earlier. I'd hate to waste your time.