.43 Spanish

The .43 Spanish was a centerfire rifle cartridge developed by Remington  designers around 1867. It was used in early rolling block rifles that Remington manufactured for the government of Spain. The cartridge is also referred to as the .433 Spanish, "11mm Spanish", and identical cartridges for the US Peabody rifle were marked "U.M.C. 43-77".

History
The .43 Spanish cartridge was produced after Spain purchased the newly invented rolling-block action single-shot rifle. The breech-loading firearm, which was marketed by Sam Remington, impressed the Spaniards after their own evaluation. In 1869, the Spanish government put in an order for 10,000 rifles. In addition to the firearms, they wanted their own cartridge and Remington developed the .43 Spanish. It was produced in two variants: the bottleneck case .43 Spanish (11.15x57mmR Remington Spanish) and the straight-wall case .43 Spanish Reformado (11.4x57mmR Reformado).

The cartridge was very similar to the .44-77 Sharps cartridge, except for the difference in their case dimensions. The Spanish military version of the cartridge was later upgraded in 1889 to a "heavier, brass-jacketed reformado bullet". While Remington stopped manufacturing the cartridge in 1918, its use in the United States became widespread after World War II because it was sold as a surplus.

"Poison bullet"
The .43 Spanish used a .454 in diameter bullet that weighed 396 gr. Its 1280 ft/s was powered by 74 gr of black powder. Instead of solid lead bullet, the .43 Spanish used a brass-jacket bullet, which was considered unusual because cupronickel, gilding metal, and copper clad steel were preferred for bullet jackets during the period. It was also the reason why American soldiers suspected that the Spaniards used poison in their bullet during the Spanish-American War. It corroded in the tropics, producing a powdery pale green verdigris once they are exposed to high humidity or salty sea air over time. The brass component, however, improved bullet penetration.

Firearms chambered

 * Argentine Modelo 1879, rifle and carbine
 * 1869 Spanish Peabody
 * Whitney–Burgess–Morse lever-action rifle (military version)
 * Model 1879 Remington–Lee