There are two versions of the 450/400 Nitro Express: 450-400 3 1/4", based on a blackpowder case; and 450-400-3" (400 Jeffery), designed for smokeless powder and introduced by W.J. Jeffery in 1902. Although performance is very similar they are not interchangeable, as the 450-400-3" has a thicker rim. The 450-400 3 1/4" is slightly more powerful, but the 450-400-3" is more common today and offers better load density with modern propellents. Collectively they were extremely popular a century ago, probably the most popular cartridge among tiger hunters and considered adequate for the world's largest game. On Craig Boddington's recommendation Hornady added the 450-400-3" to their dangerous game line; it has been popular in the Ruger Number One single shot and is currently chambered by most modern double rifle makers. With a 400-grain bullet at 2100 fps it develops much less recoil than big-bore cartridges, yet is perfect for buffalo and adequate for elephant. Kynoch loads both versions.
