It could possibly be a Savage 22 Hi-Power chambering. I believe it was available then, but I may be wrong.
As far as .308 vs .311 bore it could be either. I know I have read in a few places that Savage was kind of playing around with the 30cal bores in those days trying to find what was liked the best, and there didn't seem to be any rhyme or reason to it as far as year or model variations.
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