The .460 Weatherby Magnum is a proprietary rifle cartridge developed and marketed by Weatherby Inc., a U.S. firearms and ammunition manufacturer. It is classified as a high‑velocity, large‑bore “dangerous‑game” cartridge intended for use on the largest and most resilient game species.
Design and Development
The cartridge was introduced by Weatherby in the late 1950s as part of the company's series of magnum cartridges. It is based on the .378 Weatherby Magnum case, which is itself derived from the .416 Rigby case. The .460 Weatherby Magnum case is lengthened and straightened, then necked up to accept a .458‑inch (11.6 mm) diameter projectile. The cartridge employs Weatherby’s proprietary double‑ramp (V‑shaped) shoulder design, intended to promote efficient powder burning and higher velocities.
Technical Specifications (typical factory load)
- Bullet diameter: .458 in (11.6 mm)
- Neck diameter: .481 in (12.2 mm)
- Base diameter: .560 in (14.2 mm)
- Rim diameter: .579 in (14.7 mm)
- Case length: 2.90 in (73.7 mm)
- Overall length: 3.65 in (92.7 mm)
- Maximum pressure (SAAMI): 65,000 psi (447 MPa)
Typical factory load for a 500 gr (32.4 g) projectile:
- Muzzle velocity: 2,600 ft/s (792 m/s)
- Muzzle energy: 7,500 ft·lb (10.2 kJ)
Performance and Use
The .460 Weatherby Magnum delivers among the highest velocities for non‑rebated, non‑belted .45‑caliber cartridges, providing flat trajectories and substantial terminal energy at typical dangerous‑game ranges (up to 300 yards). It is primarily marketed for African big‑game hunting, such as cape buffalo, elephant, and other large African game species, where deep penetration and high energy are required.
Firearms Chambered
Weatherby has produced a limited number of rifles chambered for the .460 Magnum, most notably the Weatherby Mark V and early models of the Weatherby Vanguard series. Due to the cartridge’s large case dimensions and high recoil, rifles are generally built with heavy, well‑balanced actions and long barrels (typically 24 in to 30 in).
Availability
Both ammunition and component parts (brass, bullets) are produced in relatively small quantities compared to more common rifle cartridges. Weatherby continues to commercial‑grade factory ammunition, and hand‑loaders can form cases from .378 Weatherby Magnum brass.
Safety and Considerations
The cartridge generates significant recoil and muzzle blast; shooters are advised to use appropriate recoil mitigation (e.g., muzzle brake, heavy stock) and to adhere to safe handling practices. Properly maintained rifles and correct ammunition specifications are essential for reliable function.
References
- Weatherby, Inc. Official product literature (catalogs, technical data sheets).
- SAAMI (Sporting Arms and Ammunition Manufacturers’ Institute) cartridge and pressure specifications.
The information presented reflects data available from established manufacturer publications and recognized industry standards.
