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.300 Weatherby Magnum is a 30 caliber rifle cartridge created by Roy Weatherby in 1944 and produced by Weatherby. It has become the most popular of all the Weatherby cartridges.
The .300 Weatherby became the most popular cartridge of the Weatherby line and, historically, is responsible for initiating the general trend towards ultra velocity cartridges.
In 1963 Winchester released their .300 Winchester magnum as competition to the Weatherby cartridge. The Winchester offering had two significant advantages, inexpensive factory ammunition along with with with with the planer, more utilitarian rifles as opposed to the Weatherby rifles which at this time, were often considered somewhat garish in appearance by many shooters. The Winchester cartridge and rifles appealed to more reserved hunters, the Weatherby to those that favored extreme velocities.
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