.416 Rigby
From Wikipedia, the free encyclopedia
| .416 Rigby | ||
|---|---|---|
| Type | Rifle/Dangerous Game | |
| Place of origin | England | |
| Production history | ||
| Designer | John Rigby & Company | |
| Designed | 1911 | |
| Specifications | ||
| Case type | Rimless, bottleneck | |
| Bullet diameter | .416 in (10.6 mm) | |
| Neck diameter | .446 in (11.3 mm) | |
| Shoulder diameter | .540 in (13.7 mm) | |
| Base diameter | .589 in (15.0 mm) | |
| Rim diameter | .586 in (14.9 mm) | |
| Case length | 2.90 in (74 mm) | |
| Overall length | 3.720 in (94.5 mm) | |
| Rifling twist | 1-14" | |
| Primer type | FC 215 | |
| Ballistic performance | ||
| Bullet weight/type | Velocity | Energy |
| 350 gr (23 g) Lead RN | 2,173 ft/s (662 m/s) | 3,671 ft·lbf (4,977 J) |
| 350 gr (23 g) X | 2,521 ft/s (768 m/s) | 4,940 ft·lbf (6,700 J) |
| 400 gr (26 g) SP | 2,337 ft/s (712 m/s) | 4,852 ft·lbf (6,578 J) |
| Test barrel length: 26" Source: Accurate Powder [1] |
||
The .416 Rigby or 10.6x74 was first manufactured in 1911 by the British Rigby rifle and ammunition-making company. It was the first .416 rifle caliber, and rifles were built on magnum-length 1898 Mauser actions.
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.[2]
Most .416 Rigby factory-loaded ammunition pushes a 400 grain bullet in the neighborhood of 2,300 feet per second (700 m/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 .460 Weatherby Magnum is based on a belted version of the older .416 Rigby case, but is loaded to far higher pressures. The .416 Remington Magnum, using a much smaller case, will equal the veteran .416 Rigby in performance, again thanks to higher pressure.
The British who designed the .416 Rigby made it on a large cartridge case for a reason. The .416 Rigby is an enormous round by American standards, but when the British brought it out they designed it, like many of their big game cartridges, as a very powerful but low-pressure cartridge. This was done to accommodate the hot climates of India and Africa. In very hot conditions, brass cartridge cases have a tendency to stick in rifle chambers after firing because chamber pressure becomes too high, and a stuck case will jam the gun. A jam could be fatal if a lion, tiger, rhino, or other potentially charging beast was nearby. The huge cartridge case allows the .416 Rigby to give good performance while keeping chamber pressure down.
