Weatherby Hammer Custom ammunition in .280 Ackley Improved (brand part no. M280A139HCB) loads a 139-grain solid-copper bullet built for hunters who want Weatherby-level velocity paired with a purpose-engineered terminal design. The .280 AI was developed by wildcatter P.O. Ackley, who steepened the shoulder of the .280 Remington to 40 degrees and increased its powder capacity, and Weatherby’s offering pushes that platform toward the industry-leading velocity the brand is known for. Hammer Bullets are turned on a CNC lathe from a unique solid-copper blend, with every bullet weighed and micrometer-measured during production for unmatched consistency. The hollow-point nose initiates expansion immediately on impact, shedding sharp petals while the blunt-fronted remainder of the bullet stays intact for a devastating wound channel. For .280 Ackley Improved shooters who want that explosive terminal performance, this rifle ammunition is built for that job.

Key Specifications

• The chambering is .280 Ackley Improved, an Improved case that adds velocity and reach over standard .280 Remington.
• The bullet weighs 139 grains, a fast-stepping weight built to maximize velocity.
• The bullet is Hammer Custom, a CNC-lathe-turned solid-copper design.
• Each bullet is weighed and micrometer-measured during production for exceptional consistency.
• The hollow-point nose sheds sharp petals on impact while the blunt-fronted shank stays intact for a devastating wound channel.
• The bullet is engineered specifically for Weatherby’s flat-shooting cartridges, matched to this magnum’s velocity.
• Shipping weight per box runs 1.28 pounds, useful for shooters planning a case-quantity order.
• Cost runs about $4.86 per round, in line with premium solid-copper hunting ammunition.
• Each box holds 20 rounds, enough to confirm zero and still hunt the season.

Frequently Asked Questions

How does the Hammer Custom bullet perform on impact? The hollow-point nose sheds sharp petals immediately, while the remaining blunt-fronted shank stays intact and drives through for a devastating wound channel.

What is .280 Ackley Improved? It is P.O. Ackley’s steep-shouldered improvement on the .280 Remington, adding powder capacity and velocity from the same case dimensions.

Buy Weatherby Hammer Custom .280 Ackley Imp 139gr

Extreme velocity deserves a bullet engineered to make the most of it, and Hammer Custom is built specifically for Weatherby’s speed. Order from our Lubbock, Texas gun shop and it ships fast to your door.