Since this is a Medium Length Action the 7mm-08, 6.5 Creedmoor, 260 Rem or 308 would be perfect
I have a LH M591 that came as a complete weapon chambered in 300winmag. I would say that is more of a long action, not sure what a medium action would be. Was in the Nosler factory store in Bend, Oregon in 2003 and there she sat collecting dust for 2+ years, they had it marked way down, seems they couldn't sell a LH weapon so I relieved them of their stress and purchased it for $349. Tis a fine shootin' firearm, butter smooth and rock solid... You will like the end result in whatever cartridge you choose to build.
