450 Rigby

The .450 Rigby Magnum Rimless, better known simply as the .450 Rigby, is a .45 caliber (11.6 mm) rimless, bottlenecked cartridge intended for the hunting of heavy dangerous game. The cartridge is based on the .416 Rigby necked up to accept a .458-inch (11.6 mm) bullet. The cartridge is intended for use in magazine rifles. The cartridge should not be confused with Rigby’s .450 Nitro Express from around 1898, which is a rimmed cartridge that is intended for double rifles. [Wikipedia]