The .270 Weatherby Magnum cartridge was developed by Roy Weatherby in 1943 and was the first belted magnum to be offered to the public when he open his business in 1945.

CARTRIDGE SPECS

Bullet Diameter: .277 (7mm)
Common Reference: 270 Caliber
Max Case Length: 2.549”
Developed: 1943
Production Start: 1945