America's First Metallic Cartridge: The Burnside Carbine
The Burnside Carbine, designed by Ambrose Burnside, was the first U.S. military arm to use a self-contained metallic cartridge. Its unique tapered brass cartridge required a separate percussion cap and expanded to seal the breech. The carbine saw significant use with Union cavalry during the Civil War, with several design variations improving its functionality over time.









