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Some Martini-Henrys were rebarrelled to use the new. 303 British service cartridge employed black powder as a propellant, and was adopted for the Lee–Metford rifle, which had rifling designed to lessen fouling from this propellant, which replaced the Martini-Henry rifle in 1888. 303 British is relatively low compared to many other service rounds used in the early 20th century. 303-inch (7.7 mm) cartridge in its ball pattern progressed through ten marks which eventually extended to a total of about 26 variations. Military use History and development ĭuring a service life of over 70 years with the British Commonwealth armed forces the. Recommended bullet diameter for standard. 303 military surplus rifles are often found ranging from around. Measured between the grooves, the nominal size of the bore is. 303-inch (7.70 mm) is the nominal size of the bore measured between the lands which follows the older black powder nomenclature. The SAAMI (Sporting Arms and Ammunition Manufacturers' Institute) maximum average pressure (MAP) for this cartridge is 49,000 psi (337.84 MPa) piezo pressure (45,000 CUP). regulated countries are currently (2014) proof tested at 456.00 MPa (66,137 psi) PE piezo pressure. pressure to certify for sale to consumers.

regulated countries every rifle cartridge combo has to be proofed at 125% of this maximum C.I.P. 303 British can handle up to 365.00 MPa (52,939 psi) P max piezo pressure. (Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives), the. The common rifling twist rate for this cartridge is 254 mm (10.0 in) 10 in), 5 grooves, Ø lands = 7.70 millimetres (0.303 in), Ø grooves = 7.92 millimetres (0.312 in), land width = 2.12 millimetres (0.083 in) and the primer type is Berdan or Boxer (in large rifle size).Īccording to official rulings of the C.I.P. All sizes in millimeters (mm).Īmericans would define the shoulder angle at alpha/2 ≈ 17 degrees. The pronounced tapering exterior shape of the case was designed to promote reliable case feeding and extraction in bolt-action rifles and machine guns alike, under challenging conditions. 303 British has 3.64 ml (56 grains H 2O) cartridge case capacity.

7.4 Post-1945 South African developments.

6.1 Commercial ammunition and reloading.

2.7 Tracer, armour-piercing and incendiary.

It was the standard British and Commonwealth military cartridge for rifles and machine guns from 1889 until the 1950s when it was replaced by the 7.62×51mm NATO. From 1891 the cartridge used smokeless powder which had been the intention from the outset, but the decision on which smokeless powder to adopt had been delayed. It was first manufactured in Britain as a stop-gap black powder round put into service in December 1888 for the Lee–Metford rifle.

303 inch bore diameter is measured between rifling lands as is the common practice in Europe which follows the traditional black powder convention. 303-inch (7.7 mm) calibre rimmed rifle cartridge. 303 British (designated as the 303 British by the C.I.P.