Weatherby Ammunition, 280 Ackley Improved, 139 Grain, Hammer Custom, 20 Rounds Weatherby 280 Ackley Improved ammunition loaded with the 139 grain Hammer Custom bullet, packed 20 rounds per box. Weatherby has made factory ammunition for its own cartridges since Roy Weatherby introduced them, and its loads are built to the velocity these cartridges were designed for. This listing is Weatherby part number M280A139HCB (UPC 747115452675), matched to the 139 grain Hammer Custom load on weatherby.com. Weatherby Ammunition, 280 Ackley Improved, 139 Grain, Hammer Custom, 20 Rounds. The Hammer Custom Bullet The Hammer Custom is a solid copper hollow point bullet. On impact the nose sheds petals that create secondary wound channels while the shank continues on for deep penetration. Hammer bullets run at high velocity because of their lighter weight for the caliber, and they are lead free. About the 280 Ackley Improved Weatherby loads the 280 Ackley Improved to give a flat trajectory and strong retained energy at hunting distances. Heavier bullets in a caliber give more momentum and penetration for larger game, while lighter bullets shoot faster and flatter for open-country hunting. Choose the weight that matches the game you hunt and the distances you expect to shoot, then zero your rifle with that exact load. Always confirm that the cartridge headstamp matches the caliber marked on your barrel before firing. The 280 Ackley Improved headstamp must match exactly; similar-sounding cartridges are not interchangeable. If you are unsure, have a gunsmith check the chamber, and never fire ammunition that does not chamber freely without force. Getting the Best Accuracy Every rifle has its own preferences, so try a box or two at the range before your hunt. Shoot three-shot groups from a solid rest with a cool barrel, and let the barrel cool between groups. Once you find the load your rifle likes, buy enough of the same lot to zero and practice with, since different lots can shift point of impact slightly. Note your point of impact at 100, 200 and 300 yards and, if you shoot farther, confirm the drop with real shooting rather than relying only on a ballistic app. That data, recorded for this exact load, is what lets you hold correctly when the shot comes. Shot Placement and Ethics Even the best bullet depends on where it lands. Practice until you can keep your shots inside the vital zone of your game at the distances you plan to hunt, from the positions you will actually use in the field. Know your effective range, pass on shots beyond it, and wait for a broadside or quartering-away angle that gives a clear path to the heart and lungs. After the shot, mark the spot and give the animal time before following up. Storage and Handling Store ammunition and brass in a cool, dry place away from direct sunlight and solvents. Keep it in the original box until you need it so the lot number and load information stay with the rounds. Ordering and Shipping Ammunition ships to your door where state and local law allow, and you must be of legal age to buy it. Some states and cities restrict ammunition sales or require a license or in-person pickup, so check your local rules before ordering. Why Buy Weatherby Ammunition? Weatherby factory ammunition is built for Weatherby rifles and is the load the company names in its sub-MOA accuracy guarantee for its Mark V, Vanguard and Model 307 rifles. Browse more Weatherby firearms and ammunition or shop other rifle ammunition. Product Specifications Manufacturer: Weatherby Part Number: M280A139HCB UPC: 747115452675 Caliber: 280 Ackley Improved Bullet Weight: 139 grain Bullet Type: Hammer Custom Rounds per Box: 20 Case: Brass, new Source: https://weatherby.com/store/280-ackley-improved/ Frequently Asked Questions How many rounds are in a box? 20 rounds. What bullet is loaded? A 139 grain Hammer Custom. Will it work in my rifle? It will fire in any rifle chambered for 280 Ackley Improved. Always confirm the caliber marked on your barrel. Is it lead free? Yes, the bullet is solid copper. Does ammunition need an FFL? No. Ammunition ships to you directly where legal; you must meet the age and local requirements. Can I return ammunition? Ammunition sales are generally final once shipped; check our return policy before ordering. Order Weatherby 280 Ackley Improved ammunition from BattleHawk Armory today.