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The W.J. Jeffery & Co developed the .400 Jeffery NE from the .450/400 3-1 ⁄ 4-inch Nitro Express, following extraction problems with the latter cartridge.. The .450/400 3-1 ⁄ 4-inch NE was recreated by loading the old .450/400 3-1 ⁄ 4-inch Black Powder Express with cordite, transforming a low-velocity deerstalking cartridge into a genuine big-game hunting round capable of tackling even ...
The .450/400 2 3 ⁄ 8 inch Nitro Express was loaded with a 400 gr. RN bullet with 42 or 43 grains of cordite and was meant for use in newer rifles chambered for the .450/400 2 3 ⁄ 8 inch case as this loading generates greater pressure than the Black Powder Express versions of the cartridge.
The .400/350 Nitro Express was developed by John Rigby & Co by necking down the .400 Purdey and was introduced in 1899. That same year Rigby approached the engineers at Mauser to make a special Gewehr 98 bolt action to handle this cartridge, its introduction in 1900 was the birth of the magnum length bolt action, paving the way for such cartridges as the .375 H&H and .416 Rigby.
Muzzle energy is dependent upon the factors previously listed, and velocity is highly variable depending upon the length of the barrel a projectile is fired from. [2] Also the muzzle energy is only an upper limit for how much energy is transmitted to the target, and the effects of a ballistic trauma depend on several other factors as well.
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The SIGM400 Predator is a rifle while the SIGPM400 Elite PSB is a pistol. The rifles are chambered for either 5.56×45mm NATO with 14.5-inch (37 cm), 16-inch (41 cm), 18-inch (46 cm), or 20-inch (51 cm) barrels threaded 1/2x28, or chambered for .300 AAC Blackout with 9-inch (23 cm) or 16-inch (41 cm) barrels which are threaded 5/8x24 for muzzle devices such as sound suppressors.
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