The 84L Classic in 280 Ackley Improved is one of the more specialized production chamberings Kimber offers. The Ackley Improved case design reduces body taper and increases shoulder angle, boosting velocity roughly 100 fps over standard .280 Remington while improving case life. Type: Rifle Action: Bolt-Action Caliber: 280 Ackley Improved Capacity: 4 Year introduced: 2009, USA Weight: 5.8 oz Overall length: 43.5" Status: Active Intended use: Hunting / Field