.257 Weatherby Magnum

.257 Weatherby Magnum

Description

The .257 Weatherby Magnum is a .257 Caliber 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.Wikipedia
 
Rifling twist1 in 10 in (250 mm)
Case length2.545 in (64.6 mm)
Parent case.375 H&H Magnum
Case capacity84 gr H2O (5.4 cm3)
Shoulder diameter.492 in (12.5 mm)
Neck diameter.283 in (7.2 mm)