Martini Henry gradually be reduced to surplus stores for conflicts which the Machine Gun, barbed wire and Gas were to rule supreme.
Colonel E M Boxer had developed his .577 cartridge for the Snider as a replacement for the original cardboard walled round. It was simple, a brass sheet was rolled around a mandrel, to which a brass and steel base was affixed. The round contained its primer, powder, wad and lubricant. The resultant explosion caused the round to expand width-wise to provide an effective seal and prevent the escape of propellant gasses.