Weatherby created an entire line of custom cartridges, and was one of the people responsible for the industry interest in high-speed cartridges. He created a custom rifle action to accommodate his high-pressure cartridges. Weatherby started manufacturing Weatherby Guns in his garage at the Huntington Park home.
Weatherby firearms are best known for their very high-powered rifle cartridges, all bearing the name Weatherby Magnum such as the.257 Weatherby Magnum and the.460 Weatherby Magnum, and for the production of appropriately-chambered sporting rifles.
Weatherby came into the world of commercial cartridge and rifle making with a background of experimentation in cartridge wildcatting and was determined to develop a range of sporting rifle cartridges that would produce very high muzzle velocities, high bullet energies, very flat trajectories, and very hard-hitting characteristics at long range. Among those who influenced his thinking and products was the English riflemaker and cartridge designer David Lloyd.
Following Roy Weatherby"s death, the Weatherby Foundation International (initially known as the Roy East Weatherby Foundation) was established as a non-profit, tax-exempt Foundation to educate the non-hunting public about the beneficial role of ethical sporting hunting, especially its contributions to wildlife conservation. lieutenant currently leads a national initiative to foster the development of educational outdoor expositions, and as at 2007 has sponsored 78 events in 19 of the United States states, with combined attendance figures of nearly 1 million.
The Foundation annually sponsors the prestigious Weatherby Hunting & Conservation Award.