槍口初速
The .450 Nitro Express was the first Nitro Express cartridge, developed around 1898 by John Rigby. This cartridge was based on the then popular .450 Black Powder Express case with of Cordite and a jacketed bullet. Muzzle velocity is listed at 2,150 feet per second (655 m/s) with of muzzle energy. This straight case has a length of with a rim.