Martini Henry Long Chamber 1869 Troop Trial Rifle .450"
Trials of the embryonic Martini Henry rifle began to take place in 1869,with this pattern, firing a cylindrical .450” experimental boxer rolled cartridge, 3.75” (95.25mm) long, containing 85 grains of Watham Abbey RMH, a fine grain gunpowder, catalogued as the Boxer Henry Long Chamber Cartridge Pattern A. 200 rifles were manufactured at Enfield and 2000 rounds of ammunition were offered for the trial. Despite being un-marked this rifle has Enfield 1st and second proof markings to barrel and receiver, plus small W^D marking to the cocking indicator. In 1872, the long chamber rifle was discontinued as the cartridge was prone to malformation and rucking of the paper bullet wrap created a jam, the new service rifle, to be known as the Mk1 was manufactured to accept a .577/450 boxer cartridge.
