roser61,
By the time you mount scope bases, turn down the bolt, change barrels and stock, possibly a new trigger, you'll have invested as much or more than you'd have in a Rem.700 or a good Savage bolt rifle.
Unless you just want the experience of doing it, or want to be able to point and say, "I made that"... the economics of converting an 8mm milsurp to a different caliber hunting sporter and coming out ahead of a commercial equal in terms of accuracy and value are against you.
Been over this in my head and with the calculator a dozen times myself.... Seems it's just better to keep my old milsurps as they are and enjoy them that way. When I need something different, I buy something different.
Swampy