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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 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.
.303 British.303 Magnum.303 Savage.375/303 Westley Richards Accelerated Express.307 Winchester.308 Marlin Express.308 Norma Magnum.308 Winchester.308×1.5" Barnes.310 Cadet.318 Westley Richards.32 Remington.32 Winchester Self-Loading.32 Winchester Special.32-20 Winchester.32-40 Ballard.32-40 Winchester.325 Winchester Short Magnum.327 Federal Magnum
The Lee–Enfield was adapted to fire the .303 British service cartridge, a rimmed, high-powered rifle round. Experiments with smokeless powder in the existing Lee–Metford cartridge seemed at first to be a simple upgrade, but the greater heat and pressure generated by the new smokeless powder wore away the shallow and rounded Metford rifling ...
The Farquhar-Hill is a long recoil operated semi-automatic rifle with rotary bolt locking. It was .303 British caliber and fed from a 19-round drum magazine. Magazine variations included a 10-round truncated cone and a 65-round drum.
The Ross rifle is a straight-pull bolt action rifle chambered in .303 British that was produced in Canada from 1903 until 1918. [1]The Ross Mk.II (or "model 1905") rifle was highly successful in target shooting before World War I, but the close chamber tolerances, lack of primary extraction and length made the Mk.III (or "1910") Ross rifle unsuitable for the conditions of trench warfare ...
The .276 Enfield was designed with the intent of being more powerful than the .303 British cartridge used in the Lee–Enfield rifles and to be at least similar in size and performance to other large, powerful early 20th century military rifle cartridges, like the .280 Ross, 7.92×57mm Mauser, .30-06 Springfield and 7.5×55mm Swiss GP11.
In 1926, the British government changed the nomenclature of its rifles, designating the .303 calibre SMLE as No. 1 Rifles and the .22 calibre training rifles as No. 2 Rifles. For practical purposes "SMLE" and "No. 1 Rifle" are alternate names for the same weapon, but a purist would define a No. 1 as post-1926 production only.
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.