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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.
The bore designations are only an approximate relationship to the actual weight of the projectile when it was applied to modern artillery. The table below lists the metric and Imperial calibres of various British weapons, which utilised the standard after 1919:
It is sometimes included in the name of a gun to differentiate it from other guns of the same calibre or weight of shot. For example, the QF 12-pounder 18 cwt naval gun is a different (and heavier) weapon than the QF 12-pounder 8-cwt Mk I naval gun, though they both fire shells of the same approximate weight (12 pounds (5.4 kg)).
The table of imperial avoirdupois mass is the same as the United States table up to one pound, but above that point, the tables differ. The imperial system has a hundredweight, defined as eight stone of 14 lb each, or 112 lb ( 50.802 345 44 kg ), whereas a US hundredweight is 100 lb ( 45.359 237 kg ).
Cordite was used initially in the .303 British, Mark I and II, standard rifle cartridge between 1891 and 1915. [not verified in body] Shortages of cordite in World War I led to the creation of the "Devil's Porridge" munitions factory (HM Factory, Gretna) on the English–Scottish border, which produced around 800 tonnes of cordite per week. The ...
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The former Weights and Measures office in Seven Sisters, London (590 Seven Sisters Road). The imperial system of units, imperial system or imperial units (also known as British Imperial [1] or Exchequer Standards of 1826) is the system of units first defined in the British Weights and Measures Act 1824 and continued to be developed through a series of Weights and Measures Acts and amendments.
And each stone consists of twelve pounds, and each pound consists of twenty-five shillings in weight. The sum of the pounds in the fotmal is 70. The sum of the stones in the Load is 175 stones and is proved by six times thirty which is nine score (180) except for each fotmal subract two pounds multiplied as before (x30) which is 60 pounds ...