Minié Ball

Origins

Rifles were far more accurate than smoothbore muskets, but they were slow to load: a ball tight enough to grip the rifling had to be hammered down the barrel, so rifles were given only to specialists. French officers spent the 1830s and 1840s looking for an answer. Henri-Gustave Delvigne and Louis-Étienne de Thouvenin designed rifles in which a ball or bullet was deformed against a chamber or a pillar in the breech, which worked but was hard to clean. In 1849 Captain Claude-Étienne Minié proposed a simpler idea: an elongated bullet, slightly smaller than the bore, with a hollow base containing an iron cup. On firing, the gas drove the cup into the base and expanded the skirt of the bullet into the rifling. It could be loaded as easily as a musket ball.

Design & Construction

The bullet was cast or swaged from soft lead in a cylindro-conical shape, with grooves around the body to hold grease that lubricated the bore and softened the fouling. In the United States James H. Burton, an armorer at Harpers Ferry, found in 1855 that a deep enough hollow base expanded without any plug, and the plugless .58-caliber bullet of about 500 grains became the American standard; the British Enfield used a .577 bullet with a boxwood or clay plug. The bullet was issued in a paper cartridge with its powder charge. The soldier tore the cartridge, poured the powder down the barrel, pushed the bullet in point first and rammed it home, then capped the nipple. The name is pronounced "min-YAY," but American soldiers called it the "minnie ball."

Use in Service

The Minié rifle was first used in large numbers by the British in the Crimean War of 1854, where its range surprised the Russians at the Alma and Inkerman. It was the ammunition of the Springfield Model 1861 and the Enfield rifle musket, the two main infantry weapons of the American Civil War. In theory it was accurate to several hundred yards, although historians such as Earl Hess have shown that most Civil War firefights were still fought at under 150 yards, because of terrain, smoke and poor marksmanship training. Its effect on the body was terrible: the heavy, soft bullet flattened on impact and shattered bone rather than breaking it cleanly, which is why so many wounded limbs were amputated. At battles like Battle of Gettysburg it caused the great majority of casualties.

Legacy

The Minié ball made the rifle the standard infantry weapon and ended the era of the smoothbore Brown Bess Musket, though within a decade breech-loaders using metallic cartridges, like the Sharps Rifle and the Martini-Henry Rifle, made it obsolete in turn. Its principle — a bullet sealing itself in the bore by expansion — survives in hollow-based target and muzzleloading bullets. Dug Minié balls are among the most common Civil War relics, and collectors identify them by caliber, groove pattern and base cavity to trace which army and which arsenal fired them.