.257 WBY MAG Ammo
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The .257 Weatherby Magnum is a .257 Caliber (6.35 mm) belted bottlenecked cartridge. It is one of the original standard length magnums developed by shortening the .375 H&H Magnum case to approx. 2.5 inch.
The .257 Weatherby Magnum is among one of the flattest shooting commercial cartridges. The .257 Weatherby Magnum was one of the first cartridges which used the shortened, blown out and necked down. The bore diameter of the rifle is .250 inches; this would make the .257. Richard Speer manufactured the .257 Weatherby brass for Weatherby.
The .257 Weatherby Magnum shares the same cartridge case as the .270 Weatherby Magnum and the 7mm Weatherby Magnum. The .257 Weatherby Magnum was one of the first cartridges which used the shortened, blown out, and necked down .375 H&H Magnum case and served as the forerunner to the standard length magnum cartridges such as the 7mm Remington Magnum and the .338 Winchester Magnum.