Bullet: 285 gr
Grand Slam SP/CANN
(Speer)
Diameter: 0.375"
Powder: IMR 4955 (Improved Military Rifle)
Starting Powder: 100.0 gr
Max Powder: 103.6 gr
Primer: CCI 250 Mag
Case: Norma Precision AB
Trim Length: 2.903"
Cartridge Overall Length: 3.640"
Starting Velocity: 2,763
Starting Pressure:
Max Velocity: 2,878
Max Pressure:
Source: https://reloadingdata.speer.com/Downloads/speer/ReloadingPdfs/378-weatherby-magnum-with-285-gr-grand-slam-spcannpdf.pdf
Printed from Shooter's Reference on 12/21/2024: