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The .257 Weatherby Magnum is a .257 caliber (6.53 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 in (64 mm).
Weatherby, Inc. is an American gun manufacturer founded in 1945 by Roy Weatherby.The company is best known for its high-powered magnum cartridges, such as the .257 Weatherby Magnum, .270 Weatherby Magnum, .300 Weatherby Magnum, .340 Weatherby Magnum and the .460 Weatherby Magnum.
7mm Weatherby Magnum.30-378 Weatherby Magnum.224 Weatherby Magnum.240 Weatherby Magnum.257 Weatherby Magnum.270 Weatherby Magnum.300 Weatherby Magnum; 6.5-300 Weatherby Magnum.338-378 Weatherby Magnum.340 Weatherby Magnum.375 Weatherby Magnum.378 Weatherby Magnum.416 Weatherby Magnum.460 Weatherby Magnum
.256 Gibbs Magnum.256 Newton.256 Winchester Magnum.257 Roberts.257 Weatherby Magnum.26 Nosler.260 Remington.264 LBC-AR.264 Winchester Magnum.270 Weatherby Magnum.270 Winchester.270 Winchester Short Magnum.275 H&H Magnum.275 No 2 Magnum.275 Rigby.276 Enfield.276 Pedersen.277 FURY.277 Wolverine.28 Nosler.280 Ackley Improved.280 British.280 Flanged
A magnum cartridge is a firearm cartridge with a larger case size than, or derived from, a similar cartridge of the same projectile caliber and case shoulder shape. [ clarification needed ] The term derives from the .357 Magnum , the original revolver cartridge with this designation.
The .257 Roberts, also known as .257 Bob, [2] is a medium-powered .25 caliber rifle cartridge.It has been described as the best compromise between the low recoil and flat trajectory of smaller calibers such as the 5 mm (.22 in) and 6 mm (.24 in), and has more energy, but is harder recoiling, similar to larger hunting calibers, such as the 7 mm (.28 in) and 7.62 mm (.30 in).
Nigeria: Local variant designated NR-1. [17] [18] [19] Beretta BM 59: Battle rifle Italy Nigeria: Produced locally under licence by DICON. Machine guns; M2 Browning [2] Heavy machine gun United States: DShK: Heavy machine gun Soviet Union: FN MAG: General-purpose machine gun Belgium: RPK: Light machine gun Soviet Union: Sniper rifles; Alex .338 ...
As with other Weatherby Magnum cartridges, the 7mm Wby Mag design is based on the .300 Holland & Holland Magnum case. It is necked down to 7mm (.284) and features the trademark double radius shoulder. The case was blown out to eliminate the taper and shortened to feed from a standard length action like the .257 Wby Mag and the .270 Wby Mag.