The 240 delivers 3,500 fps muzzle velocity (80 grain bullet) and is, on average, considerably faster than any existing standard 6mm cartridge. This means more striking energy delivered at the target, with less bullet drop at longer ranges.
CARTRIDGE SPECS
Bullet Diameter: .243 (6.2mm)
Common Reference: 6mm Caliber
Max Case Length: 2.5”
Production Start: 1968
The .257 Weatherby was one of Roy Weatherby’s earliest creations and quickly became his favorite. This flat shooting cartridge has grown to be one of Weatherby’s most popular rounds.
CARTRIDGE SPECS
Bullet Diameter: .257 (6.35mm)
Common Reference: 25 Caliber
Max Case Length: 2.549”
Developed: 1943
Production Start: 1945