Bullet: 120 gr
Spitzer BTSP
(Speer)
Diameter: 0.257"
Powder: IMR 7977 (Improved Military Rifle)
Starting Powder: 62.1 gr
Max Powder: 68.9 gr
Primer: CCI 250 Mag
Case: Weatherby
Trim Length: 2.539"
Cartridge Overall Length: 3.170"
Starting Velocity: 2,875
Starting Pressure:
Max Velocity: 3,146
Max Pressure:
Source: https://reloadingdata.speer.com/Downloads/speer/ReloadingPdfs/257-weatherby-magnum-with-120-gr-spitzer-btsppdf.pdf
Printed from Shooter's Reference on 05/03/2024: