From the Wikipedia article on the .308 Winchester:
"Although very similar to the military 7.62mmx51mm NATO, specifications for the .308 cartridge are not identical and there are special considerations that may apply when mixing one cartridge with differently chambered arms."
Keep in mind, however, that the Sporting Arms and Ammunition Manufacturers Institute (SAAMI) renders them interchangeable.
76.2cm
762mm
30 inches is 762mm
.030" or .762mm
1 centimeter=10 millimeters 762millimeters/10millimeters=76.2 centimeters
The .50 caliber is larger in diameter than the .308. If you are referring to the bullets for the .50 BMG and the .308 Winchester, the .50 is MUCH heavier, and much longer than the .308.
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