X-Bolt Max Long Range in 280 Ackley Improved. Adjustable Max composite stock, heavy fluted 24" barrel, threaded muzzle. The 280 AI in the Max Long Range platform is Browning's answer to hunters who want PRS-platform features in a hunting chambering. Type: Rifle Action: Bolt-Action Caliber: 280 Ackley Improved Capacity: 4 Year introduced: 2022, USA Weight: 130 oz Overall length: 45.5" Status: Active Intended use: Hunting, Big Game, Long Range