308 Norma mag any good???

[TRAP55]

The only belted magnum cartridges factory chambered in the Model 70 were Winchester Magnums, or Holland & Holland.
Winchester never chambered the Mod 70 in .308NM, so it's obviously been re-chambered, if it has the Winchester roll stamp on the barrel. If it doesn't, it's been re-barreled. Either way, collector value on a pre-64 Model 70 is gone, in good shape, $400 tops.
Now, that said, if there's provenance that a famous custom gun builder, like Ackley or Biesen, built the rifle, that changes things.

[toby]

It will always have collector value it can be re barreled with another Winchester period barrel.

[mark501w]

If it's a 3" receiver it is very rare dangerous game guys like them like the large Mauser action .

[HUTCH 7.62]

It will always have collector value it can be re barreled with another Winchester period barrel.

It has a Winchester barrel as it had sights and the famous Barrel bulge or boss for the rear sight.

[mark501w]

For the heck of it send pix of the writing on the barrel.