If it was me I would contact Gentry Gunsmithing in Belgrade, MT--he builds larger guns such as this on Winchester actions or an action of your choice--I looked at some of his guns at a FNAWS convention here in town a few years back --really good workmanship and not too bad of a price--I and they were in the 8 to 9 lb range--I am sure he would built to your specifications.I was actually contemplating calling him regarding something similar for myself--I would use a synthetic stock simply from a durability standpoint--you could use a stainless action and barrel and have it coated with a flat black to eliminate glare--express sights and slap on a Leupold VX-III, 1-5 power and you would be set..-- I would choose the 458 Lott caliber if it was me..
Ripp