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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.
The .458 SOCOM (11.63×40mmRB) is a moderately large round designed to work in an AR-15 platform.This is achieved by installing a 458 bolt and barrel. The 300-grain (19 g) round offers a supersonic muzzle velocity of 1,900 ft/s (580 m/s) and 2,405 ft⋅lbf (3,261 J), [1] similar to a light .45-70 but with a much smaller case.
The Bushmaster ACR is a modular semi-automatic rifle that is available for the civilian market in 5.56×45mm NATO, 6.8mm Remington SPC, .450 Bushmaster and .300 AAC Blackout. ACR BASIC – 16.5 in (419mm) barrel ACR ENHANCED – 16.5 in (419mm) barrel [9] ACR DMR – 18.5 in (470mm) barrel [38] ACR SBR – 10.5 in (267mm) barrel [39]
The .500/450 No. 1 Nitro for Black was the same cartridge loaded with mild loadings of cordite, carefully balanced to replicate the ballistics of the black powder version. Unlike other similar black powder cartridges, such as the .450 Black Powder Express and .500/450 Magnum Black Powder Express , the .500/450 No. 1 Express never became a Nitro ...
STANAG magazines loaded with .223 Rem (left) and .450 Bushmaster (right) Over the years different cartridges that fit into the STANAG magazine emerged, some rounds like .300 AAC Blackout have the same rim diameter as .223 Remington and only require a barrel change to be used in a firearms that was previously using in .223 Remington .
The .450/400 2 3 ⁄ 8 inch Black Powder Express was loaded with a bullets from 210 to 270 grains (14 to 17 g) driven by 79 to 84 grains (5.1 to 5.4 g) of black powder. The .450/400 2 3 ⁄ 8 inch Nitro for Black was loaded with a jacketed 270 grain round nose bullet driven by 38 grains (2.5 g) of cordite.
The Bushmaster M4 [2] or M4A3 [3] is a semi-automatic or select-fire carbine size assault rifle manufactured by Bushmaster Firearms International, modeled on the AR-15. It is one of the Bushmaster XM15 line of rifles and carbines.
The .450 Rigby is a rifle cartridge designed in 1994 by John Rigby & Co. for the purpose of hunting large, thick-skinned dangerous African game animals. The cartridge is essentially a .416 Rigby necked up to accept a .458 in (11.6 mm) bullet, although with a higher operating pressure and much of the original taper removed.