The Kimber Mountain Ascent in .280 Ackley Improved uses a 24-inch match stainless barrel in the titanium-receiver lightweight package. The .280 AI was standardized by SAAMI in 2008 after decades as a wildcat. It is considered the finest all-around North American hunting cartridge by many experienced hunters — more velocity than .280 Rem with improved case efficiency. Type: Rifle Action: Bolt-Action Caliber: .280 Ackley Improved Capacity: 4 Year introduced: 2016, USA Weight: 5.5 oz Overall length: 44.5" Status: Active Intended use: mountain hunting, backcountry