I'm a .280 Ackley fan, because it is a great all around rifle.

Kimber's 84 Hunter with a spare mag, in that caliber, with a Swarovski Habicht (older scope) 2.5-10 x 42 mm would weigh about 6.5-7 lbs with Talley lightweight rings. Probably shave 6-8 ounces off that if you went with 7mm-08, which is also a fine cartridge