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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 civilian headstamp has the "SBR" at 12 o'clock and the caliber at 6 o'clock. On the military headstamp the "SB" is at 12 o'clock and the "R" is at 6 o'clock. It manufactured 7,92mm Mauser and .303 British military ammunition because most of the regional powers used either captured German or Austrian war surplus or British military aid.
The .303/25, sometimes known as the .25/303 is a wildcat centrefire rifle cartridge, based on the .303 British, necked down to fire a .257 projectile, originating in Australia in the 1940s as a cartridge for sporterised rifles, particularly on the Lee–Enfield action; similar versions also appeared in Canada around the same time.
Theories abound: it was made for use by Chinese-backed insurgents, it was designed to get in on the surplus ammo market, or it was designed to make users leery of Western-made surplus ammunition and get them to buy new foreign-made ammo. LC 52 Chinese copies of American .30 Carbine ammo with forged Lake City (headstamp "LC") markings. The ...
[citation needed] Most are made primarily for hunting species such as deer, kangaroo, and are generally based on the .303 British because of the post-war popularity of that round and of the cheap surplus Australian Lee–Enfield MkIII military rifles available. Many of these surplus rifles were re-barreled to .257 caliber, known as the 303-25.
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.
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A .32 ACP FMJ cartridge, a .32 ACP FMJ cartridge in a blued .303 British supplemental chamber, and a .303 British FMJ cartridge (left to right) A caliber conversion device is a device which can be used to non-permanently alter a firearm to allow it to fire a different cartridge than the one it was originally designed to fire.