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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 rifle was designed with an iron sight line consisting of rear receiver aperture battle sight calibrated for .303 British Mk VII ball ammunition at 300 yd (274 m) with an additional ladder aperture sight that could be flipped up and was calibrated for 200–1,000 yd (183–914 m) in 100 yd (91 m) increments and 1,000–1,650 yd (914–1,509 ...
NA&A Co (National Arms & Ammunition Co) Martini–Enfield rifles were very well made and are more than capable of handling modern commercial .303 British ammunition, but, as with all second hand firearms, they should always be checked by a competent gunsmith before attempting to fire them.
This mark was adopted by the Canadian government in 1867 upon its creation as a Dominion to replace the British government's broadshead arrow mark. The ammunition color code system used by Canada used the British system for .303 ammunition, the American system for .30-06 ammunition, and later the NATO system for all other ammunition.
The M1917 Enfield, the "American Enfield", formally named "United States Rifle, cal .30, Model of 1917" is an American modification and production of the .303-inch (7.7 mm) Pattern 1914 Enfield (P14) rifle (listed in British Service as Rifle No. 3), which was developed and manufactured during the period 1917–1918.
His proposal for dealing with zeppelin bombers was adopted in 1916 as the Cartridge S.A. Ball .303 inch Pomeroy Mark I. It was a standard .303 British cartridge loaded with a 155-grain (10.0 g) cupronickel-jacketed lead bullet including a hollow copper tube filled with 15 grains (0.97 g) of 73% dynamite. Pomeroy's wife reportedly filled the ...
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 ...
Later on this experimental loading was discarded in favor of the standard issue .303 British ammunition. After several trials, including troop trials at the Front, and some use by observers in aircraft, in 1918 the Farquhar–Hill rifle was found to be suitable for military use and an official request was issued for procurement of as many as ...