11.15x58Rmm / .43 Spanish Remington (11x53mm Spanish)

11.15x58Rmm / .43 Spanish Remington (11x53mm Spanish)

The 11.15x58mmR Spanish, also known as the .43 Spanish Remington or sometimes referred to as the 11x53mm Spanish, was developed in the late 1860s for use in the Remington Rolling Block rifles adopted by Spain. It is a rimmed, bottlenecked, centerfire cartridge and one of the early metallic cartridges designed for military service during the transition from muzzleloaders to breech-loading rifles. Its adoption marked a key step in modernizing the Spanish infantry armament at the time.

The cartridge fired a large lead bullet approximately 0.439–0.445 inches in diameter, propelled by black powder. Original military loads featured bullet weights around 370–400 grains with black powder charges in the range of 77–80 grains. The round was known for its long effective range and excellent penetration — more than adequate for the battlefield needs of the 1870s and 1880s. It was capable of velocities in the 1,300–1,400 fps range with impressive terminal energy thanks to the heavy bullet and large case capacity.

Though originally adopted by Spain, the cartridge and the rifles chambered for it were sold or issued to several countries and militias throughout the Americas and elsewhere. The 11.15x58R saw use in Latin America, the Philippines, and the Caribbean, as Remington’s Rolling Block became one of the most widely distributed rifles of the 19th century. In fact, many surplus rifles chambered in this cartridge made their way into civilian hands well into the 20th century, especially in the U.S. where they became popular among early black powder cartridge enthusiasts and reloading hobbyists.

The 11.15x58mmR should not be confused with the similar but slightly shorter .43 Egyptian or the original paper-patched .44 Remington bottleneck cartridge. Due to subtle variations in chamber dimensions and case length, careful measurement is essential when identifying and loading for these rifles. Modern brass can often be formed from trimmed and resized .348 Winchester or similar cases, though specialized production brass is also available from select manufacturers. Reloading requires attention to detail, particularly in bullet sizing and neck tension, as bore diameters can vary between individual rifles.

Today, the .43 Spanish maintains a quiet but dedicated following among black powder and vintage military rifle shooters. It’s especially favored by those who enjoy shooting restored or preserved Rolling Block rifles in historical reenactments, long-range black powder events, or simply as part of collecting turn-of-the-century firearms. While modern factory ammunition is scarce, components and loading data remain available through specialized sources such as Lee Precision, Buffalo Arms, and several vintage cartridge reloading forums.

Source: Multiple historical and handloading references; originally designed for Remington Rolling Block rifles adopted by Spain in the 1860s.