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Left to right:
1953 M70 30-06
1953 M70 308
1956 M70 30-06

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Parts:
1953 M70 30-06
1953 M70 308


What does it all mean?
No the feed lips on 30-06 and 308 are the same.
But the ejector, magazine, magazine follower, magazine spring, and that thingy attached to the extractor collar, are different.

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway
The man who makes no mistakes does not usually make anything.-- Edward John Phelps