The Kynoch .400/350 Nitro Express is a classic British big-game hunting cartridge developed in the early 20th century by Kynoch, a renowned ammunition manufacturer. This cartridge, specifically designed for use in double rifles, was intended for large and dangerous game hunting, such as African and Indian big game, including elephants and tigers.

The inert cartridge case of the .400/350 Nitro Express is a finely crafted piece of ammunition history. The brass casing, which measures approximately 2.75 inches in length, is characterized by its thick walls, necessary to withstand the high pressures generated by the potent powder charges used in the original live rounds. The case features a rimmed design, which was typical of cartridges intended for double rifles, ensuring reliable extraction after firing.

Kynoch's headstamp is prominently displayed on the base of the cartridge, signifying its origin and authenticity. This inert case, devoid of powder and primer, is safe for display and collecting purposes, offering enthusiasts a tangible connection to the golden age of safari hunting. The Kynoch .400/350 Nitro Express cartridge case is not just a piece of ammunition; it is a relic of a bygone era, representing the craftsmanship and adventurous spirit of early 20th-century hunters