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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 .303/22, sometimes known as the .22/303, is a wildcat centrefire rifle cartridge based on the .303 British, necked down to fire a .224 projectile, originating in Australia in the 1930s as a cartridge for sporterised rifles, particularly on the Lee–Enfield action. Similar versions also appeared in Canada around the same time. [3]
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.
.280 British.280 Jeffery.280 Flanged.300 Rook.300 Sherwood.300 H&H Magnum.303 British.303 Magnum.375/303 Westley Richards Accelerated Express.310 Cadet.318 Westley Richards.333 Jeffery.338 Lapua Magnum.350 Rigby.400/350 Nitro Express.400/360 Nitro Express.360 No. 5 Rook.360 No. 2 Nitro Express.369 Nitro Express.375 Flanged Nitro Express
[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.
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.303 Mk IIC SAA Ball: Calibre.303 British: Action: Martini Falling Block: Rate of fire: 10 rounds per minute: Muzzle velocity: 2,200 feet per second (670 m/s) Effective firing range: 1,000 yards (910 m) Maximum firing range: 2,000 yards (1,800 m) Feed system: Single shot: Sights: Sliding ramp rear sights, fixed-post front sights
[77] 303/25 calibre sporterised SMLEs are very common in Australia today, although ammunition for them has been very scarce since the 1980s. [76] The restrictions placed on "military calibre" rifles in New South Wales were lifted in 1975, and many people who had converted their Lee–Enfields to the "wildcat" rounds converted their rifles back ...