Load Data for .257 Roberts


 
Bullet: 75 gr HP  (HDY)
Diameter: 0.257"
 
Powder: IMR 4831 (Improved Military Rifle)
Starting Powder: 46.5 gr
Max Powder: 51.5 gr
 
Primer: REM 9½
 
Case: REM
Trim Length: 2.223"
 
Cartridge Overall Length: 2.795"
 
Starting Velocity: 3,017
Starting Pressure: 34,100
Max Velocity: 3,403
Max Pressure: 43,500 CUP
 
Compressed
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/