7mm Weatherby Magnum

The 7 mm Weatherby Magnum is a powerful 7 mm rifle cartridge offered by the Weatherby firearms company in their Mark V rifles. The cartridge was one of the first cartridges offered by the Weatherby company. It was developed in the 1940s by Roy Weatherby. Wikipedia
 
Case length2.55 in (65 mm)
Bullet diameter.284 in (7.2 mm)
Overall length3.25 in (83 mm)
Maximum pressure)65,000 psi
Base diameter.511 in (13.0 mm)
Neck diameter.312 in (7.9 mm)