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The .450 Bushmaster is descended from the Thumper concept popularized by the gun writer Jeff Cooper.Cooper was dissatisfied with the small-diameter 5.56×45mm NATO (.223 Remington) of the AR-15, and envisioned a need for a large bore (.44 cal or greater) cartridge in a semi-automatic rifle to provide one-shot kills on big-game animals at 250 yards.
Some American 7.62 mm bull barrels, as well as some barrels for .450 Bushmaster (11 mm caliber). 11/16-24 M18 1.5 mm Accuracy International .338 LM. 45/64"-16.93 M22 0.75 mm Saiga 12 gauge shotgun 111/128"-33.87 M22.23 1.814 mm Some rifles in 12.7 mm caliber 7/8"-14 M24 1 mm Accuracy International 12.7 mm, Micro Uzi, Uzi pistol 121/128"-25.4
The parent case (5.56×45mm NATO) was trimmed down to 1.560" and re-sized with a 7.62×40mm WT sizing die. [3] The overall case length after the shortening and re-sizing is 1.565". The cartridge was designed to use .308" diameter bullets in weights of 110 to 150 grains, with a standard twist rate of 1-12". [ 1 ]
The .375 SOCOM is a fairly new cartridge, designed by Tromix in 2013. Taking a .458 SOCOM cartridge case and sizing the neck down to .375 caliber, resulted in a hard hitting AR-15 compatible cartridge, that has a considerable velocity and range advantage over the .458 SOCOM as well as other big bore AR-15 cartridges.
Hornady released the Vintage Match ammunition to replicate the original military performance specifications unique to wartime rifles such as the Mauser, Lee–Enfield, Mosin–Nagant, Swedish Mauser or others chambered in 6.5×55mm, .303 British, 7.62×54mmR, 7.92×57mm Mauser and .30-06.
450 rounds/min cyclic (= 7 1 ⁄ 2 / second) Muzzle velocity: 900 ft/s (274 m/s) Effective firing range: Sights fixed to 100 yards (91 m) [12] Feed system: 30-round detachable box or 32-round detachable box magazine: Sights: Fixed rear peep sight and blade foresight, calibrated to 100 yards for caliber .45 M1911 ball ammunition [12]
The .577 Snider cartridge was eventually replaced in service by the .577/450 Martini–Henry cartridge in the 1870s. The .577 Snider cartridge is considered by most commentators to be obsolete, with large scale commercial production having ceased in the 1930s. New brass can be formed from a 24 gauge hull and reloading dies are available from Lee.
The predecessor to the .45-70 was the .50-70-450 cartridge, adopted in 1866 and used until 1873 in a variety of rifles, many of them were percussion rifled muskets converted to trapdoor action breechloaders. The conversion consisted of milling out the rear of the barrel for the trapdoor breechblock, and placing a .50 caliber "liner" barrel ...