Bullet: 140 gr Match Burner  (Barnes)

Diameter: 0.264"

 

Powder: IMR 7977 (Improved Military Rifle)

Starting Powder: 70.4 gr

Max Powder: 75.7 gr

 

Primer: FED 215

 

Case: Weatherby

Trim Length: 2.815"

 

Cartridge Overall Length: 3.600"

 

Starting Velocity: 2,927

Starting Pressure:  

Max Velocity: 3,155

Max Pressure:  

 

**Data was tested out of a SAAMI spec 24” barrel. Most rifles chambered in this cartridge will have 26” barrels. Users may see an increase in velocity out of barrels longer than 24”
Barrel: 24" with 1:8" twist.

 

Source: https://www.barnesbullets.com/wp-content/uploads/2021/05/6.5-300WBY.pdf