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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.
A guide to the recoil from the cartridge, and an indicator of bullet penetration potential. The .30-06 Springfield (at 2.064 lbf-s) is considered the upper limit for tolerable recoil for inexperienced rifle shooters. [2] Chg: Propellant charge, in grains; Dia: Bullet diameter, in inches; BC: Ballistic coefficient, G1 model; L: Case length (mm)
The .577/450 Martini–Henry is a black powder, centrefire rifle cartridge.It was the standard British service cartridge from the early 1870s that went through two changes from the original brass foil wrapped case (with 14 parts) to the drawn brass of two parts, the case and the primer.
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 cylinder is bored straight through with no step. Later versions used an inside the case lubricated bullet of .357" diameter instead of the original .38" with a reduction in bore diameter. The difference in .38 Special bullet diameter and case diameter reflects the thickness of the case mouth (approximately 11/1000-inch per side).
The 7.7 mm Arisaka can use the same .311–.312 inch bullets as the .303 British, [13] and the standard military load delivered the same muzzle energy as the .303 British. Factory loaded ammunition and brass cases are available from Norma, Graf's, and Hornady, Sierra and Speer also produce usable bullets.
The brass cases can be formed from .30-30 Winchester, .32 Winchester Special, and .38-55 Winchester casings, if no correct brass is available. [4] Great care must be taken as the Winchester brass is about .020” smaller at the base and case failure is possible. It is safer to obtain correct .303 Savage brass, which shows up occasionally in ...
Bullet diameter: 0.308 in (7.82 mm) Land diameter ... The .303 British Bren gun was also subject to conversion to fire the 7.62×51mm NATO ... It used standard brass ...