The Mark II had a tendency to split at the base, so the Cartridge S.A. Ball Martini Henry Rifle Rolled Case Mark III was developed which had two layers of .004 in brass overlapped by 0.5 inches with a .004 in brass strengthening strip with a small sight hole punched in the outer coil as a visual check that the strip was correctly placed and an inner and outer base cap turned over at the base.