Cooper Firearms Model 52 in .280 Ackley Improved — one of the few production rifles to offer this cartridge with a hand-fitted action and premium walnut stock. Montana craftsmanship at a semi-custom price. Type: Rifle Action: Bolt-Action Caliber: .280 Ackley Improved Capacity: 3 Year introduced: 2007, USA Weight: 82 oz Overall length: 43.5" Status: Active Intended use: Mountain Hunting, Long-Range Hunting