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Its fine, but you dont want to use a load you developed in a .308 case in a 7.62 case since it has thicker walls which equal less internal volume, making for higher pressures with the same amount of powder.... if you work up your loads in a 7.62 case, you are fine to load the same load in a .308 case, but not the other way around...
They actualy are the same caliber as far as the chamber is concerned. The .308 win was released as the commercial version of the 7.62x51 nato.
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