I have a Mark X action with a light varmint 24" Shilen cm barrel. Target crown new matt blueing. It has never been fire. The action is the old style with the release in the bow. I "think" the twist is a 1:9 but I will check. So 70gr or lighter.

What is the current value range?

finished gun oughta bring $5-1000... action is worth at least half that..maybe more...

As usual it is worth whatever someone is willing to pay for it. Sounds like it has the makings of a fine Varmint rig though. Pics might be helpful.