.426 according to Brownells.
Application: Hunting
Ballistic Coefficient: 0.426
Brand Style: Super-X
Bullet Style: Power-Point
Bullet Weight (Grains): 175
Cartridge: 7 mm Remington Magnum
Hunting Type: Big Game
Muzzle Energy: 3178
Muzzle Velocity (feet per second): 2770
Rounds per Box: 20