Bullet: 450 gr Banded Solids  (Barnes)

Diameter: 0.458"

 

Powder: TAC (Ramshot)

Starting Powder: 77.5 gr

Max Powder: 85.5 gr

 

Primer: FED 215m

 

Case: HDY

Trim Length: 2.760"

 

Cartridge Overall Length: 3.580"

 

Starting Velocity: 2,262

Starting Pressure:  

Max Velocity: 2,453

Max Pressure:  

 

*Recommend crimping case mouth into front cannelure. *Barnes 450- and 500-grain TSX bullets have the front cannelure positioned to maximize case capacity in the .458 Win Mag. When loading these bullets in the .458 Lott we recommend trimming the cases back to 2.760”, so that these bullets can be loaded within the SAAMI spec COAL of 3.600”. If your magazine box will handle cartridges longer than 3.600”, this step is not necessary
Barrel: 24" with 1:10" twist.

 

Source: https://www.barnesbullets.com/wp-content/uploads/2021/05/458Lott.pdf