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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.
The .303 Savage has a small, but loyal fraternity of shooters who reload this cartridge. While major ammunition manufacturers have long since halted production of ammo, dedicated followers can procure loaded ammunition and brass cases through smaller enterprises.
.303-06.30-30 Winchester.30-378 Weatherby Magnum.30-40 Krag.300 Precision Rifle Cartridge.300-221.300 AAC Blackout.300 H&H Magnum.300 Blaser Magnum.300 ICL Grizzly.300 Lapua Magnum.300 Norma Magnum.300 Remington Short Action Ultra Magnum.300 Remington Ultra Magnum.300 Rook.300 Ruger Compact Magnum.300 Savage.300 Sherwood.300 Weatherby Magnum
Manufactured .303 British ammunition during World War I. Bought out by National Lead Company in 1911. Western Cartridge Company closed the Lowell plant in 1927 and moved its machinery to East Alton, Illinois. Western Cartridge would make the ammo and US Cartridge would distribute it under their brandname.
The .303 Magnum was a bottlenecked centerfire rifle cartridge that was produced in both semi-rimmed and rimless versions. The cartridge fired a projectile of 174 grains (11.3 g) at 2,850 feet per second (870 m/s). The cartridge's case capacity was the same as the .30-06 Springfield, although performance was considered to favour the .303 Magnum.
Also, the .303 was not the first military round with that trait since the old .577 Snider bullet had a hollow core, leaving wounds known for being particularly nasty. [14] The use of the term dumdum for expanding bullets other than the early .303 designs is considered slang by most ammunition and ballistics sources.
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.
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.