Bullet: 400 gr Barnes Originals  (Barnes)

Diameter: 0.458"

 

Powder: IMR 4198 (Improved Military Rifle)

Starting Powder: 44.0 gr

Max Powder: 48.0 gr

 

Primer: FED 210m

 

Case: Starline Brass

Trim Length: 2.095"

 

Cartridge Overall Length: 2.515"

 

Starting Velocity: 1,988

Starting Pressure:  

Max Velocity: 2,131

Max Pressure:  

 

Compressed
*Crimping is not required for single shot rifles. *This data is intended for use only in Ruger #1 & #3 rifles in good condition. Do not use this data in any other type of firearm. *The SAAMI MAP value for this cartridge is 28,000 psi. We shot the Ruger #1 data to 55,000 psi. *The COALs with Barnes Original Spitzer bullets, as well as with 300 and 350 grain Spitzer TSX bullets, exceed the SAAMI maximum COAL of 2.550”. This is not an issue, as these bullets and loads are intended for use only in Ruger #1 and #3 single shot rifles.
Barrel: 24" with 1:20" twist.

 

Source: https://www.barnesbullets.com/wp-content/uploads/2021/05/45-70RugerNo1.pdf