Printed from Shooter's Reference on 11/28/2023:
Bullet: 400 gr
Powder: IMR 4007 SSC (Improved Military Rifle)
Starting Powder: 67.5 gr
Max Powder: 72.5 gr
Primer: FED 215m
Trim Length: 2.990"
Cartridge Overall Length: 3.735"
Starting Velocity: 1,933
Max Velocity: 2,083
*Recommend crimping the case mouth into the front cannelure groove. *CIP specs for this cartridge call for a bore diameter of 0.400” and a groove diameter of 0.410”. *Many older .450/400 rifles have varying bore and groove diameters. Barnes’ loading data is recommended only for modern firearms in good condition that are built to current specs. If in doubt, have a competent gunsmith evaluate the firearm before using these loads.
Barrel: 25" with 1:16" twist.