Have you ever examined a single reloading manual in your life?
Yes. And I also stayed in a Holiday Inn. And 7.62mm = 0.300" NOT .308"
Here is a link that gives the 7.62x51 bullet diameter in mm. It says the 7.62 is 7.82mm in diameter. That is .308” in diameter.
http://en.wikipedia.org/wiki/7.62x51mm_NATO