.300 Weatherby Magnum

The .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. Wikipedia
 
Case length2.825 in (71.8 mm)
Parent case.300 H&H Magnum
Bullet diameter.308 in (7.8 mm)
Overall length3.562 in (90.5 mm)
Maximum pressure)65,000 psi (450 MPa)
Shoulder diameter.492 in (12.5 mm)