+P
Bullet: 87 gr
TNT HP
(Speer)
Diameter: 0.257"
Powder: 760 (Winchester)
Starting Powder: 43.0 gr
Max Powder: 47.0 gr
Primer: CCI 250 Mag
Case: WIN
Trim Length: 2.223"
Cartridge Overall Length: 2.780"
Starting Velocity: 2,868
Starting Pressure:
Max Velocity: 3,163
Max Pressure:
Source: https://reloadingdata.speer.com/Downloads/speer/ReloadingPdfs/257-roberts-p-with-87-gr-spitzer-sp-hot-corpdf.pdf
Printed from Shooter's Reference on 11/21/2024: