Category Archive: 303 British Ammo

During a service life of over 70 years with the British Commonwealth armed forces the .303-inch cartridge in its ball pattern progressed through ten marks which eventually extended to a total of about 26 variations. The bolt thrust of the .303 British is relatively low compared to many other service rounds used in the early 20th century.

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The .303 British (designated as the 303 British by the C.I.P. and SAAMI) or 7.7×56mmR, is a .303-inch (7.7 mm) calibre (with the bore diameter measured between the lands as is common practice in Europe) rimmed rifle cartridge first developed in Britain as a black-powder round put into service in December 1888 for the Lee–Metford …

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