7.62mm is equal to 30 one hundreths of an inch or .30 caliber. When a .30 cal barrel is made, first a .30 inch hole is drilled through the center, this is where the .30 cal. designation comes from. Then the spiral grooves are cut in the barrel, so naturally the bullet diameter must be equal to the barrel's groove diameter. I would say the Russians made their rifleing slightly deeper than did the US, thus the need for slightly larger bullets.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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