Roy Weatherby designed the 460 Weatherby Magnum, a belted, bottlenecked rifle cartridge, in 1958. It's based on a.378 Weatherby Magnum that's been necked up to take a.458-inch (11.6 mm) bullet. The.460 Weatherby Magnum was developed as an African hazardous game rifle cartridge for hunting large, thick-skinned dangerous species in Africa. The Sporting Arms and Ammunition Manufacturers' Institute (SAAMI) published voluntary standards for the cartridge in January 1994, hence it is not considered a proprietary cartridge.
The 460 Weatherby Magnum case is made from a necked up.378 Weatherby Magnum case. Although the.378 Weatherby Magnum case was influenced by the.416 Rigby case, it is regarded as a one-of-a-kind case that has served as the parent cartridge for various high-performance cartridges. The.460 Weatherby Magnum requires a large propellant capacity in order to propel a 500 gr (32 g) bullet at 2,700 ft/s (820 m/s).
The.460 Weatherby Magnum is intended to have headspace on its belt. Because of their tight chamber tolerance, they headspace on the belt rather than the shoulder, as opposed to most current belted cartridges, which headspace on the shoulder regardless of the belt.
Although the 460 Weatherby Magnum is a powerful cartridge, it cannot compensate for inexperience or bad aim. Harvesting bison, elk, moose, and brown bear can be performed by lowering the cartridge's performance to meet the criteria. The.460 Weatherby Magnum cartridge may be loaded to perform similarly to the.45-70 Government and the.450 Rigby. The much-decreased recoil of such loadings is a benefit.
The 450 Rigby, sometimes known as the 450 Rigby Magnum Rimless, is a rimless, bottlenecked cartridge with a caliber of.45 caliber (11.6 mm) designed for hunting big hazardous wildlife. The cartridge is based on a.416 Rigby that has been necked up to take a.458-inch (11.6 mm) bullet. The cartridge is designed for magazine rifles and is not to be confused with Rigby's.450 Nitro Express, which was released in 1898.
The CIP regulates and regulates the.450 Rigby dimensions and specifications. A bore diameter of 11.43 millimeters (0.450 in) and a groove diameter of 11.63 millimeters are recommended by the CIP (0.458 in). The barrel will feature a six-groove rifling profile with a twist rate of one revolution per 420 mm (17 in) and a groove width of 3.60 mm (0.142 in). Maximum pressure of 4,000 bar is specified by CIP (58,000 psi).
The 450 Rigby, unlike many modern.458 caliber dangerous game cartridges, was designed to run at lower pressures. The maximum pressure restriction imposed by CIP is 4,000 bar (58,000 psi). With the 500-grain (32 g) bullet, the cartridge readily reaches the target 2,300–2,400 ft/s (700–730 m/s) at these pressures. In tropical settings, where the cartridge is designed for usage, the lower pressures enable improved operating dependability. With the 500 gr (32 g) cartridge, the 450 Rigby easily approaches the coveted 2,400 ft/s (730 m/s) velocity record while staying well within the CIP pressure limitations.
The 450 Rigby was created with the intention of hunting large, thick-skinned dangerous game animals in Africa. Due to the cartridge's performance, it would be a superior cartridge for certain game animals, such as African elephants, Cape buffalo, rhinoceros, and maybe hippopotamus, than the standard standby cartridges.
