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The Nessler ball was a short conical-cylindrical soft lead bullet, with a conical hollow in its base. The bullet was designed with a lead skirting. Its intended purpose was to expand under the pressure and obturate the barrel and increase muzzle velocity.
A similar ball design called the Chace ball (after its inventor W.B. Chace) was developed in 1861 in the United States but was not adopted.
The bullet could be quickly removed from a paper cartridge with the gunpowder poured down the barrel and the bullet pressed past the muzzle. It was then rammed home with the ramrod, which ensured that the charge was packed and the hollow base was filled with powder. When fired, the expanding gas pushed forcibly on the base of the bullet, deforming it to form a better seal for consistent velocity, longer range, and accuracy.
- David Westwood (2005). Rifles: An Illustrated History Of Their Impact. ABC-CLIO. ISBN 1-8510-9401-6.
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