Load Data for .257 Roberts


 
Bullet: 90 gr HPBT  (Sierra)
Diameter: 0.257"
 
Powder: IMR 4831 (Improved Military Rifle)
Starting Powder: 47.4 gr
Max Powder: 51.5 gr
 
Primer: REM 9½
 
Case: REM
Trim Length: 2.223"
 
Cartridge Overall Length: 2.775"
 
Starting Velocity: 3,049
Starting Pressure: 37,500
Max Velocity: 3,313
Max Pressure: 45,800 CUP
 
Compressed
Barrel: 24" with 1:10" twist.
 
Source: https://www.hodgdonreloading.com/
 

Printed from Shooter's Reference on 12/30/2024:
https://www.shootersreference.com/reloadingdata/257-roberts/