Bullet: 100 gr HP  (HDY)

Diameter: 

 

Powder: N560 (VihtaVuori)

Starting Powder: 76.8 gr

Max Powder: 81.8 gr

 

Primer:  Large Rifle Magnum

 

Case: Weatherby

Trim Length: 2.539"

 

Cartridge Overall Length: 3.209"

 

Starting Velocity: 3,561

Starting Pressure:  

Max Velocity: 3,839

Max Pressure:  

 

CAUTION: Loads less than the listed starting load may cause excessive chamber pressure and must not be used!
Barrel: 26" with 1 in 9" twist.

 

Source: https://www.vihtavuori.com/reloading-data/rifle-reloading/?cartridge=77