Load Data for .257 Roberts


 
Bullet: 100 gr AFSP  (Swift)
Diameter: 0.257"
 
Powder: IMR 4831 (Improved Military Rifle)
Starting Powder: 45.3 gr
Max Powder: 47.8 gr
 
Primer: FED 210m
 
Case: REM
Trim Length: 2.223"
 
Cartridge Overall Length: 2.780"
 
Starting Velocity: 2,876
Starting Pressure: 44,500
Max Velocity: 3,082
Max Pressure: 53,100
 
Barrel: 24" with 1:10" twist.
 
Source: https://www.hodgdonreloading.com/
 

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