.416 Rigby info
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Type Rifle/Dangerous Game
Place of origin England
Designer John Rigby & Company
Case type Rimless, bottleneck
Bullet diameter 10.57 mm (0.416 in)
Neck diameter 11.33 mm (0.446 in)
Shoulder diameter 13.72 mm (0.540 in)
Base diameter 14.96 mm (0.589 in)
Rim diameter 14.99 mm (0.590 in)
Rim thickness 1.65 mm (0.065 in)
Case length 73.66 mm (2.900 in)
Overall length 95.25 mm (3.750 in)
Case capacity 8.28 cm³ (128 gr H2O)
Rifling twist 420 mm (1-16.5 in)
Primer type Large rifle magnum
Maximum pressure 325.00 MPa (47,137 psi)
Bullet weight/type Velocity Energy
350 gr (23 g) Barnes TSX 2,612 ft/s (796 m/s) 5,304 ft·lbf (7,191 J)
400 gr (26 g) Barnes Solid 2,515 ft/s (767 m/s) 5,619 ft·lbf (7,618 J)
410 gr (27 g) Bertram 2,650 ft/s (810 m/s) 6,393 ft·lbf (8,668 J)
450 gr (29 g) Woodleigh 2,286 ft/s (697 m/s) 5,223 ft·lbf (7,081 J)
Test barrel length: 26"
Source: Reloaders Nest 
The .416 Rigby or 10.6x74mm was designed in 1911 by John Rigby & Company of London, England as a dangerous game cartridge and is the first one to use a bullet with a diameter of .416". The rifles, as built by John Rigby & Co., were initially made up on Original Magnum Mauser actions although in later years, some were made on standard length actions, a perfect example being the rifle used by legendary professional hunter Harry Selby. Other famous users of the cartridge were Commander David Enderby Blunt, John Taylor and Jack O'Connor.
3 Use on game
4 See also
The cartridge case is one of the largest ever designed for a bolt action rifle and the huge case capacity allowed for good performance without creating excessive chamber pressure. The cartridge was originally loaded with Cordite, a powder that resembles long spaghetti strands that burns very hot and is sensitive to changes in ambient temperature. Like many cartridges designed by the British in this era, most of its intended use would have been in the hot climates of Africa and India. Large increases in chamber pressure often resulted under such conditions, sometimes making it difficult to extract fired cartridges, something that would be virtually impossible with the .416 Rigby.
Most .416 Rigby factory-loaded ammunition propels a 400 grain bullet in the neighborhood of 2,300 ft/s . Additionally, it doesn't have the tremendous recoil of other large cartridges such as the .460 Weatherby Magnum. Recently-offered lighter-weight bullets, affordable reloading brass, and reasonably priced American and imported rifles have made this caliber increasingly popular for hunting large game in the United States.
The fairly modern .416 Weatherby Magnum is based on a belted version of the older .416 Rigby case, and in factory form is loaded to higher pressures. The .416 Remington Magnum, using a much smaller case, will equal the original .416 Rigby loads in performance, again thanks to higher pressure.
The .416 Rigby can be loaded to similar high pressures in modern bolt actions and will yield performance similar to the .416 Weatherby with a 400 grain bullet at 2,700 ft/s. However such loads will exceed the safe pressure limits and cannot be used in older original rifles.
However affordable modern bolt actions rifles such as the CZ550 now far outnumber older actions. It is quite normal for the modern .416 Rigby owner to turn his gun into a high powered longer range rifle. With the lighter 300 grain bullets available, velocities over 3,050 ft/s are quite possible allowing the Rigby to take game at further ranges. Some load data is now acknowledging two load levels for the Rigby, original and modern as a result.
Use on game
Until recently, the use of .416 cartridges was mostly confined to Africa, where they were used primarily on dangerous or "thick-skinned" large game such as rhino, elephant and Cape buffalo.
The worst recoiling gun I've ever shot was the .460 Weatherby, and the one I shot even had a muzzle brake. I was shooting offhand, and my earmuffs, hat and shooting glasses came right off my head. Almost as bad was the .378 Weatherby without the muzzle brake. The .416 Rigby's recoil felt very similar to the .375 H&H IMO - a definite "thumper", but not nearly as brutal as the .460. This rifle has never been scoped, and I shot it using the open sights. It's really not a long-range rifle, so I'd recommend something very rugged and lightweight in a variable scope of about 1X-4X or 1.5X-5X. Scopes like this have nice long eye reliefs and big fields of view so you can quickly find what you want to shoot at. .....Rick