Weatherby Select Plus Rifle Ammo 30-378 Wby Mag 180 gr Scirocco 3500 fps 20/ct 6DCB4502 WM. This white-hot cartridge is based on the 378 necked down to 30 caliber and packed with powder. Originally billed as the world's fastest 30 caliber cartridge it will push a 30 caliber bullet 3500 feet per second. Reintroduced as a Weatherby production cartridge in 1996. Specifications for Weatherby Select Plus Rifle Ammunition 30-378 Wby Mag 180 gr Scirocco 3500 fps 20/ct 6DCB4502: Manufacturer: Weatherby Caliber: .30-378 Weatherby Magnum Number of Rounds: 20 Bullet Weight: 180 grain Muzzle Velocity: 3500 ft/s Features of Weatherby Select Plus Rifle Ammunition 30-378 Wby Mag 180 gr Scirocco 3500 fps 20/ct: Based on the 378 necked down to 30 caliber Packed with powder Pushes a 30 caliber bullet 3500 feet per second Developed by Roy Weatherby in 1959 Reintroduced as a Weatherby production cartridge in 1996 Package Contents: Weatherby Select Plus Rifle Ammunition 30-378 Wby Mag 180 gr Scirocco 3500 fps 20/ct Initially a wildcat cartridge developed by Roy Weatherby in 1959 at the request of the United States Army. This white-hot cartridge is based on the 378 necked down to 30 caliber and packed with powder. Originally billed as the world's fastest 30 caliber cartridge it will push a 30 caliber bullet 3500 feet per second. Reintroduced as a Weatherby production cartridge in 1996. WMF303180SCO