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Technically .308 and 7.62 Nato (7.62x51) are the same size but loaded to slightly different pressures. You can shoot either in either but most suggest you dont shoot .308 in a 7.62 nato due to the higher pressure.
The difference in 7.62x39mm and 7.62x51mm is they are a completely different round and one is 12mm longer. ALL .30 caliber guns are 7.62 mm in diameter so there are many 7.62x XXmm guns out there and they are NOT interchangeable. For example .30-06 would be 7.62x63 and .300 WM would be 7.62x67.