The most modern chambering any of my rifles have is from 1957, the 223 next youngest is the 308 (52) then backwards in regular steps to a couple of methusalahs.
The invention of smokeless powder, the drawn case and the Spitzer bullet shape are the great leaps forward everything since has just been baby steps.
30 cal or there abouts was determined to have about the best sectional density and balance of performance velocity, recoil and range wise for military applications.
The progressive Scandinavians went with 6.5. Nothing new is really new and the old 6.5 swede in a modern action as a hunting rifle would still be every bit as good as a creedmore or whatever.
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