New Ultralight Arms Light Mountain Rifle in 280 Remington. The 280 Rem Light Mountain Rifle is a connoisseur's choice — the 7mm bore's superior long-range ballistics over the 270 Win, in an ultralight platform that no conventional rifle maker can match in weight. For the hunter who wants the best long-range performance available in a standard-length cartridge delivered from the lightest possible rifle, this combination is definitive. Type: Rifle Action: Bolt-Action Caliber: 280 Remington Capacity: 1 Year introduced: 2006, USA Weight: 53 oz Overall length: 42" Status: Active Intended use: hunting, mountain hunting