High Quality Content by WIKIPEDIA articles! The .44 Henry, also known as the .44 Rimfire, the .44 Long Rimfire, or the 11x23R (11x23mm rimfire) cartridge was a rim-fire round that uses a .875 inch casing. The round has a total length of 1.345 inches. It uses a 200 or 216 grain bullet with a .446 diameter. The cartridge was loaded with 26 to 28 grains of black powder. The round had a muzzle velocity of approximately 1125 feet per second, with a muzzle energy of 568 foot pounds of energy.