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It is similar to the .44 AMP, but is necked down to accept the smaller diameter bullet. The same is true for the .41 JMP, .30 LMP, .25 LMP, and .22 LMP. [2] Presently, loaded ammunition is available from Cor-Bon as well as SBR Ammunition, [11] and new .44 AMP brass is available from Starline Brass.
The .44 Auto Magnum Pistol (AMP) is a large-caliber, semi-automatic pistol cartridge developed in 1971 by Harry Sanford. [2] The primary use is in the Auto Mag Pistol . [ 3 ] The cartridge was also employed in the Wildey automatic pistol, including a few other custom pistols. [ 4 ]
Despite the ".44" designation, guns chambered for the .44 Magnum round, its parent case, the .44 Special, and the .44 Special's parent case, the .44 Russian all use 0.429 in (10.9 mm) diameter bullets. [3] The .44 Magnum is based on the .44 Special case but lengthened and loaded to higher pressures for greater velocity and energy.
The pistol is offered with a choice of either single-action or double-action trigger mechanisms. Barrels are currently available in 8 in (203 mm), 10 in (254 mm) or 12 in (305 mm) lengths. [ 11 ] Other lengths of 5 in (127 mm), 6 in (152 mm), 7 in (178 mm) and 14 in (356 mm) have been discontinued. [ 12 ]
Although not originally designed for handguns, several rifle and shotgun cartridges have also been chambered in a number of large handguns, primarily in revolvers like the Phelps Heritage revolver, Century Arms revolver, Thompson/Centre Contender break-open pistol, Magnum Research BFR, and the Pfeifer Zeliska revolvers.
The most well-known is the .44 Magnum which uses a 0.429 to 0.430 inch diameter bullet, depending on jacket or cast. Though less common than the smaller .38 caliber family of cartridges, the caliber is popular with many shooters and the .44 Magnum in particular facilitated the rise of handgun hunting .
Even so, it still achieved a ballistic coefficient of only 0.153, which reflects very poor long range capabilities; the .44 Henry is a large and slow bullet, giving poor external ballistics and a great deal of ballistic drop during its trajectory, making hitting a target past 200 yards almost impossible for the average shooter. [4]
The firearm was a single-action, six-shot revolver accurate from 75 up to 100 yards, where the fixed sights were typically set when manufactured. The rear sight was a notch in the hammer, only usable when the revolver was fully cocked. The Colt .44-caliber “Army" Model was the most widely used revolver of the Civil War.