Bullet: 150 gr TSX  (Barnes)

Diameter: 0.308"

 

Powder: IMR 4350 (Improved Military Rifle)

Starting Powder: 67.0 gr

Max Powder: 70.5 gr

 

Primer: FED 215m

 

Case: WIN

Trim Length: 2.840"

 

Cartridge Overall Length: 3.515"

 

Starting Velocity: 3,085

Starting Pressure:  

Max Velocity: 3,244

Max Pressure:  

 

*With 130- and 168-grain TSX bullets, the case mouth falls in front of the ogive/shank junction at the listed COAL. Use a factory crimp die to lightly crimp the case mouth against these bullets to increase neck tension and improve feeding. *Powder charges of less than 100 percent density are recommended when loading 165-grain Banded Spitzers, because of the length of the bullets
Barrel: 24" with 1:10" twist.

 

Source: https://www.barnesbullets.com/wp-content/uploads/2021/05/300H-HMagWeb.pdf