Otto - I could see a "S" type model of 2001, with Alex Henry forewood, 26" slender barrel, fine front sight band and 1/4 rib in a 7x57R(or standard) or .303. The barrel should be at least 24" and 26" would be proper for the single shot.
: .303 chambering reamers can be purchased for a .308 groove diameter is this is just a handloading proposition, and then 220 gr. Hornady's could be used to advantage. Otherwise, there are some barrel makers producing .312's, I think.
: I have a buddy building a match rifle, .303 chamber on a .308 barrel.