Norma American 257 weatherby magnum



Product Overview of 257 weatherby magnum ammunition

For many years, Norma ammunition has built an outstanding reputation as premium ammunition for hunters in Europe and Africa. Today, Norma USA is pleased to offer American PH,  257 weatherby magnum ammunition designed specifically for the North American big game hunter. This ammunition is loaded with premium hunting bullets for maximum terminal performance.

Norma Soft Point bullets are conventional lead-tipped bullets perfect for hunting thin-skinned game. On impact, these bullets rapidly expand and mushroom to produce immediate devastation to the vitals. Norma American 257 weatherby magnum

Product Information

257 Weatherby Magnum
Grain Weight
100 Grains
100 Round
Muzzle Velocity
3510 Feet Per Second
Muzzle Energy
2736 Foot Pounds
Bullet Style
Jacketed Soft Point
Lead Free
Case Type
Velocity Rating

The 257 weatherby is a .257 caliber (6.53 mm) belted bottlenecked cartridge. It is one of the original standard length magnums developed by shortening the 257 weatherby magnum ammunition case to approx. 2.5 in (64 mm). Of the cartridges developed by Roy Weatherby, the .257 Weatherby Magnum was known to have been his favorite, and the cartridge currently ranks third in Weatherby cartridge sales, after the 257 weatherby magnum ammunition 

The .257 Weatherby Magnum is one of the flattest shooting commercial cartridges. It is capable of firing a 115 gr (7.5 g) Nosler Ballistic Tip bullet at 3,400 ft/s (1,036 m/s) generating 2,952 ft⋅lbf (4,002 J) of energy[3] which is comparable to factory loadings of the .30-06 Springfield and the .35 Whelen in terms of energy.

Discrepancies between the metric and U.S. diameters of the bullet may cause some confusion. A .257 bullet has a metric bullet diameter of 6.53 mm. However, in Europe cartridge designation nomenclature for a large part relies on the bore diameter. As the bore diameter of the .257 Weatherby Magnum is .250 inches this would make it a 6.35 mm caliber cartridge which uses 6.5 mm bullets (not to be confused with 6.5 mm caliber cartridges which use 6.7 mm/.264″ bullets).


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