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The .303 British (designated as the 303 British by the C.I.P. [2] and SAAMI [3]) or 7.7×56mmR, is a .303-inch (7.7 mm) calibre rimmed tapered bottleneck centerfire rifle cartridge. The .303 inch bore diameter is measured between rifling lands as is the common practice in Europe which follows the traditional black powder convention.
.276 Enfield (7×60mm) rimless bottlenecked rifle cartridge for which the action was originally designed.303 British (7.7×56mmR) rimmed cartridge for which the P14 action was adapted During the Second Boer War the British were faced with accurate long-range fire from Mauser rifles, model 1893 and 1895, in 7×57mm caliber.
.280 British.280 Jeffery.280 Flanged.300 Rook.300 Sherwood.300 H&H Magnum.303 British.303 Magnum.375/303 Westley Richards Accelerated Express.310 Cadet.318 Westley Richards.333 Jeffery.338 Lapua Magnum.350 Rigby.400/350 Nitro Express.400/360 Nitro Express.360 No. 5 Rook.360 No. 2 Nitro Express.369 Nitro Express.375 Flanged Nitro Express
This required mass-produced wears and arms for both sides. After the war, to recoup some money, they sold the supplies in stores. Thus the military surplus store was born. In the 1870s, Francis Bannerman VI operated "Bannerman's surplus". [4] His surplus company was one of the largest ever to operate.
The civilian headstamp has the "SBR" at 12 o'clock and the caliber at 6 o'clock. On the military headstamp the "SB" is at 12 o'clock and the "R" is at 6 o'clock. It manufactured 7,92mm Mauser and .303 British military ammunition because most of the regional powers used either captured German or Austrian war surplus or British military aid.
[citation needed] Most are made primarily for hunting species such as deer, kangaroo, and are generally based on the .303 British because of the post-war popularity of that round and of the cheap surplus Australian Lee–Enfield MkIII military rifles available. Many of these surplus rifles were re-barreled to .257 caliber, known as the 303-25.
The .303/22, sometimes known as the .22/303, is a wildcat centrefire rifle cartridge based on the .303 British, necked down to fire a .224 projectile, originating in Australia in the 1930s as a cartridge for sporterised rifles, particularly on the Lee–Enfield action. Similar versions also appeared in Canada around the same time. [3]
.303 Mk IIC SAA Ball: Calibre.303 British: Action: Martini Falling Block: Rate of fire: 10 rounds per minute: Muzzle velocity: 2,200 feet per second (670 m/s) Effective firing range: 1,000 yards (910 m) Maximum firing range: 2,000 yards (1,800 m) Feed system: Single shot: Sights: Sliding ramp rear sights, fixed-post front sights