Load Data for .257 Weatherby Magnum


 
Bullet: 90 gr CX  (HDY)
Diameter: 0.257"
 
Powder: IMR 7828 SSC (Improved Military Rifle)
Starting Powder: 62.9 gr
Max Powder: 69.9 gr
 
Primer: FED 215
 
Case: Weatherby
Trim Length: 2.535"
 
Cartridge Overall Length: 3.182"
 
Starting Velocity: 3,198
Starting Pressure: 49,800
Max Velocity: 3,545
Max Pressure: 62,100
 
Barrel: 26" with 1:10" twist.
 
Source: https://www.hodgdonreloading.com/
 

Printed from Shooter's Reference on 07/21/2025:
https://www.shootersreference.com/reloadingdata/257-weatherby-magnum/