[4] The .43 Spanish cartridge was produced after Spain purchased the newly invented rolling-block action single-shot rifle.

[7] The Spanish military version of the cartridge was later upgraded in 1889 to a "heavier, brass-jacketed reformado bullet".

[8] 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.

[9] It was also the reason why American soldiers suspected that the Spaniards used poison in their bullet during the Spanish-American War.

[9] It corroded in the tropics, producing a powdery pale green verdigris once they are exposed to high humidity or salty sea air over time.