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Now, for more confusion, you can read that 7.62mm is also different for different countries! Russian 7.62x39mm ammo is .310 inch in the 7.62x39 round. NATO 7.62x51mm is .308 inch. Also, 8mm Mauser can be either .318 for JR bore or .323 for JS bores.....
If you ever get confused, check the nominal bullet diameter in a reloading book.
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