Bullet: 400 gr Banded Solids  (Barnes)

Diameter: 0.410"

 

Powder: IMR 4007 SSC (Improved Military Rifle)

Starting Powder: 67.5 gr

Max Powder: 72.5 gr

 

Primer: FED 215m

 

Case: HDY

Trim Length: 2.990"

 

Cartridge Overall Length: 3.735"

 

Starting Velocity: 1,933

Starting Pressure:  

Max Velocity: 2,083

Max Pressure:  

 

*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.

 

Source: https://www.barnesbullets.com/wp-content/uploads/2021/05/450-400NitroExpress3Web.pdf