Bullet: 300 gr TSX  (Barnes)

Diameter: 0.411"

 

Powder: Varget (Hodgdon)

Starting Powder: 52.5 gr

Max Powder: 56.5 gr

 

Primer: FED 210m

 

Case: HDY

Trim Length: 2.573"

 

Cartridge Overall Length: 3.210"

 

Starting Velocity: 1,977

Starting Pressure:  

Max Velocity: 2,128

Max Pressure:  

 

Compressed
*SAAMI specs call for a maximum COAL of 3.175”. The Barnes 300-grain TSX bullet was deliberately produced with a semi-spitzer style ogive and a cannelure positioned to load the cartridge to a COAL of 3.210”. This exceeds SAAMI specs in order to maximize case capacity and take advantage of the improved ballistic performance the bullet’s semi-spitzer ogive offers. *Recommend crimping case mouth into the front cannelure groove.
Barrel: 24" with 1:14" twist.

 

Source: https://www.barnesbullets.com/wp-content/uploads/2021/05/405WinchesterWeb.pdf