The Rifle-Musket and the Mini� Ball
by Allan W. Howey

In 1836, a London gunsmith named William Greener found a way to improve Norton's design for expansion of the bullet base. He inserted into the hollow area a wooden plug that would push forward when the gun was fired and force the bullet's base outward. The result was that the bullet fit more uniformly inside the barrel, producing more reliable and accurate fire.

Norton's bullet with Greener's refinement eventually came before the British army for approval for use in the field, but the army's old-school officers rejected it. It was an overly conservative decision that squandered the opportunity to develop this innovative design into a truly remarkable weapon.

Several years after Norton had begun developing his hollow-base bullet, French weapons experts began working on a similar design. Eventually, three French army officers would share the credit for what would become the mini� bullet: Captain Henri-Gustave Delvigne, Colonel Louis-Etienne de Thouvenin, and Captain Claude-Etienne Mini�.

Delvigne led the way when he designed a muzzleloading rifle to fire a new type of bullet. In 1826, Delvigne built a unique rifle barrel with an independent gunpowder chamber at its breech. This chamber was separated from the rest of the barrel by a strong lip, beyond which the powder could pass, but not the bullet. In the earliest models, after the chamber was filled with gunpowder, Delvigne rammed a standard soft, round lead ball down the barrel and pounded it against the lip with the ramrod until it flattened just enough to grip the rifling grooves. He soon discovered, however, that the pounding disfigured the ball and greatly reduced its accuracy, so he designed an elongated, cylindrical bullet with a flat base that would expand more evenly under the ramrod blows. In 1840, Delvigne even received a patent for an explosive bullet of this general design. (Imagine pounding that down a rifle barrel!) In time, Delvigne's design proved unsuitable for general military use; the powder chamber quickly became clogged, and the bullet still ended up too deformed for accurate flight.

In 1828, Thouvenin modified and improved upon Delvigne's gun design. He replaced the lip and powder chamber inside the barrel with a hard metal post that screwed into the gun's breech. After loading, the flat base of the elongated, cylindrical lead bullet rested upon the post in a position to be easily and uniformly forced into the rifling grooves when compressed by the ramrod. The Thouvenin design was a moderate improvement over Delvigne's, and the French army selected it for trials in 1846. The gun and bullet combination was still not practical for widespread military use; the rifle breech was very difficult to clean, and the metal post was prone to breaking.

Delvigne's developments inspired Mini�, who had served with the French Chasseurs in several African campaigns, to do further work toward making an efficient, effective bullet. In 1849, he came up with one that more closely resembled Norton's than Delvigne's. Like Norton's bullet, Mini�'s had a hollow cylindrical base and a rounded conical nose. Mini� also incorporated a plug in the bullet's hollow base to assist expansion, just as Greener had done to Norton's design. Instead of a wooden plug, however, Mini� used an iron cup, which in effect served the same purpose as Thouvenin's metal post. The explosion of the gunpowder would drive the iron cup forward and expand the bullet's base to fit the rifling grooves snugly.

By this point in the story, it should not be surprising to learn that the French army never adopted the new bullet. It took the British army to use it in their new 1851 Enfield rifles, paying Mini� 20,000 pounds for his patent. The army also had to pay Greener 1,000 pounds, after he won a patent infringement lawsuit over the bullet's plug design. The bullet as it would be used by the soldiers in blue and gray was now virtually complete. It had also acquired the name that stuck among English-speaking troops�minnie ball, even though the captain's French surname was properly pronounced min-YAY and his innovation was not a ball but a cone-shaped bullet.

In the early 1850s, James H. Burton, a master armorer at the U.S. arsenal at Harpers Ferry, Virginia, gave the mini� bullet the form it would take into the Civil War. By lengthening the bullet slightly and thinning the walls of its hollow base, Burton was able to dispense with the iron plug. The base of the improved bullet expanded just as well as Mini�'s but was much easier and cheaper to mass-produce. By the mid-1850s, the fully evolved mini� bullet made it possible to build an infantry weapon as easy to load as the old smoothbore musket but with the accuracy and range of a rifle. The term rifle-musket reflected the weapon's lethal combination of attributes.

U.S. Secretary of War Jefferson Davis, future president of the Confederacy, adopted the rifle-musket and mini� bullet for the U.S. Army in 1855. An improved version of the rifle-musket�the 1861 model built by the federal armory in Springfield, Massachusetts�became the principal infantry weapon of Northern soldiers in the Civil War.


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