The .56-56 Spencer was an American

black powder Gunpowder, also commonly known as black powder to distinguish it from modern smokeless powder, is the earliest known chemical explosive. It consists of a mixture of sulfur, carbon (in the form of charcoal) and potassium nitrate (saltpeter). Th ...

rifle A rifle is a long-barreled firearm designed for accurate shooting, with a barrel that has a helical pattern of grooves ( rifling) cut into the bore wall. In keeping with their focus on accuracy, rifles are typically designed to be held with ...

cartridge. T6- d244 - Fig

Designed for the Spencer rifle and carbine, patented 6 March 1860, it was employed by

cavalry Historically, cavalry (from the French word ''cavalerie'', itself derived from "cheval" meaning "horse") are soldiers or warriors who Horses in warfare, fight mounted on horseback. Cavalry were the most mobile of the combat arms, operating a ...

during the

American Civil War The American Civil War (April 12, 1861 – May 26, 1865; also known by other names) was a civil war in the United States. It was fought between the Union ("the North") and the Confederacy ("the South"), the latter formed by states ...

, first appearing at Sharpsburg in rifle form. No Spencer carbines were on issue at the

Battle of Gettysburg The Battle of Gettysburg () was fought July 1–3, 1863, in and around the town of Gettysburg, Pennsylvania, by Union and Confederate forces during the American Civil War. In the battle, Union Major General George Meade's Army of the P ...

, though two units under Custer had the rifles. The .56-56 was loaded with a slug of 350–360 gr (22.7–23.3 g) over 42–45 gr (2.7–2.9 g) of

. It was loaded by a variety of companies, and was also used in the Ballard and Joslyn

carbine A carbine ( or ) is a long gun that has a barrel shortened from its original length. Most modern carbines are rifles that are compact versions of a longer rifle or are rifles chambered for less powerful cartridges. The smaller size and light ...

s. It is a short-ranged cartridge, ineffective on anything larger than deer. Commercially loaded ammunition continued to be available into the 1920s and 1930s.

Nomenclature

The nomenclature of Spencer cartridges was unique. Unlike later cartridges such as the .44-40 Winchester and .45-70, where the first number indicated caliber and the second the charge weight, the .56-56 refers solely to the case. The first 56 is the diameter of the case at the base .56 inches (14.2 mm), measured just past the rim, and the second 56 is the diameter at the case mouth, also . Later versions of the cartridge included the .56-52, .56-50, and .56-46, which had varying degrees of taper in the cases, to accommodate smaller diameter bullets. All of these cartridges are rimfire primed. The actual bullet diameter of the .56-56 varied between .54 and .555 inches (13.7–14.1 mm), depending on ammunition manufacturer. The .56-52, made by Spencer, and the .56-50, made by Springfield, differed only in the degree of crimp, with the .56-50 having a greater crimp; both fired 350 grain bullets. The .56-46 fired a 320 to 330 grain bullet.Barnes, Frank C., ed. by John T. Amber. ''Cartridges of the World'' (Northfield, IL: DBI Books, 1972), p. 281, ".56-56 Spencer". .

References

{{DEFAULTSORT:56-56 Spencer Pistol and rifle cartridges

Nomenclature

See also

References