The primer of a cartridge case initiates the main propellent when the firing pin of a weapon impacts against it. Other identifying features of the cartridge are the annulus (ring around the primer) colour, bullet tip colour and the colour of the cartridge case itself. The main method of identification to determine the origin and type of 303 cartridge is the headstamp, which will be dealt with later. The official nomenclature for the cartridge is the 303 British or 7.7x56R (7.7mm calibre, 56mm case length, rimmed). It was the main cartridge used by the British army until it was finally replaced in the 1950s by the 7.62×51 Nato cartridge. Since then it has under gone a number of changes, with a wide variety of bullet types, and is still produced today. 303 began life as far back as 1889 and was originally used in the Lee-Metford rifle. 303 inch ammunition can be quite challenging, especially for the beginner.
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