.46 rimfire

[3] In 1868, Remington paid a royalty fee to Smith & Wesson for use of the Rollin White patent and began to produce .46 Short metallic cartridge conversions for their New Model Army.

These converted revolvers were also capable of firing the .46 Long cartridges when they were introduced a few years later.

[4] The Remington New Model Army was a .44 caliber percussion cap revolver.

In the nomenclature of the time, .44 caliber referred to the bore diameter of the barrel which was nominally 0.440".

These revolvers were generally loaded with a .457" diameter lead ball (48-gauge), ensuring a good seal in the chamber.