Weatherby 280 Ackley 139gr Hammer Custom. This Weatherby Ammunition features Jacketed Hollow Point (JHP) bullets that deliver strong stopping power perfect precision and consistency. With special offers on Ammunition and other superior rifle ammo from trusted brands like Weatherby you re sure to find the perfect firepower for your next hunting trip or range visit. Stock up today to save big on ammunition and other top-tier tactical hunting and outdoor gear at OpticsPlanet. Specifications for Weatherby 280 Ackley 139gr Hammer Custom: Manufacturer: Weatherby Caliber: .280 Remington Ackley Improved Number of Rounds: 20 Bullet Type: Jacketed Hollow Point (JHP) Bullet Weight: 139 grain Application: Hunting Package Type: Box Included Accessories: None Primer Style: Centerfire Package Contents: Weatherby 280 Ackley 139gr Hammer Custom 20rd/bx 10bx/cs What is Weatherby 280 Ackley 139gr Hammer Custom good for? The manufacturer suggests that it is best for hunting.