The .444 Marlin (10.9×57mmR) is a rifle cartridge designed in 1964 by Marlin Firearms and Remington Arms. It was designed to fill in a gap left by the older .45-70 when that cartridge was not available in any new lever action rifles; at the time it was the largest lever-action cartridge available. The .444 resembles a lengthened .44 Magnum and provides a significant increase in velocity. It is usually used in the Marlin 444 lever-action rifle.
444 Marlin was 2.225 inches long, and the . 444 was capable of firing the 240-grain bullet at a muzzle velocity of 2,350 feet per second, and generated 2,942 foot-pounds of energy, making the rifle and caliber capable of hunting bear deer, elk and moose out to 200 or 250 yards.
The .444 Marlin can push a 240-grain (16 g) bullet at velocities over 2,400 ft/s (730 m/s) generating 3,070 ft⋅lbf (4,160 J) of energy. SAAMI has rated this cartridge at 44,000 CUP. It functions efficiently when used with cast lead bullets. Hand-cast bullets allows the shooter to optimize the alloy for strength and expansion at the higher velocities generated by the Marlin over the traditional .44 caliber bullets. There are several commercial moulds available for the hand-caster: the SAEC #433 mould which casts a 300-grain (19 g) gas-checked bullet, and the Lyman 429640 at 280 grains (18 g) are two of the more potent bullets for this caliber. Proper cartridge length is maintained by seating the bullet to the correct depth and using a crimp die to put a firm crimp on the seated bullet to prevent slippage in the magazine tube.444 marlin for sale
Best cast bullet accuracy in the .444 Marlin is attained when utilizing bullets sized to .432″ diameter, both in the older “Micro-Grooved” and the newer “Ballard” style barrels. This bullet diameter is dictated more by the large diameter of chamber throats than by groove diameter of the barrel. A projectile closely fitting the throat dimensions greatly enhances the cast bullet performance of this cartridge.444 marlin for sale