I wouldn't worry about the cailber. Rare calibers in the pre-'64 bring a premium. Look at the price of a .358, 9mm, 7x57 or 300 sav in a Model 70.
With that being said, a Model 70 Supergrade is a wonderful rifle. You could do a whole lot worse than a 30-06. If it fits you buy it and go kill a truck load of game. I have never felt lacking with my 70 stainless in 30-06.
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