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New to 7.62 rounds have question

No problem... Wish I had all three cases here that I could line up an show you the difference but suffice to say that they are all very different and cannot be used interchangeably
 
While all .30 caliber (bullet diameter), the cases, pressures, etc are all vastly difference. Even still, metric/Russian calibers are .311 in bullet diameter while your American cartridges are .308 in diameter.

In the image below, you have 7.62x54R on the left, 7.62x51mm/.308 in the middle and 7.62x39 Russian on the right.
j7ajh3.jpg
 
If you do that you will do it (2) twice your first and last time.

.308 bullet dia .308

7.62 x 39 bullet dia .311

hope this will help you.

Listen to their words and read all the good cautions these guys are trying to help you stay alive.
 
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