Load Data for .257 Roberts


 
Bullet: 90 gr GMX  (HDY)
Diameter: 0.257"
 
Powder: IMR 4350 (Improved Military Rifle)
Starting Powder: 40.0 gr
Max Powder: 44.0 gr
 
Primer: REM 9½
 
Case: REM
Trim Length: 2.223"
 
Cartridge Overall Length: 2.880"
 
Starting Velocity: 2,837
Starting Pressure: 39,400
Max Velocity: 3,025
Max Pressure: 44,200 CUP
 
Barrel: 24" with 1:10" twist.
 
Source: https://www.hodgdonreloading.com/
 

Printed from Shooter's Reference on 12/21/2024:
https://www.shootersreference.com/reloadingdata/257-roberts/