Barrel bore and bullet diameters are all over the place for the 7.62x39 mm (Russian) with the former measuring from 0.308" to 0.311" and the latter being 0.308", 0.310", 0.311" or 0.312".
BRASS CASED PPU 7.62 X39 AMMO AVAILABLE NOW!!!, Atlantic Firearms
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7.62x39mm Gel Test - 7 Loads Put to the Test - Firearms News
Is the 7.62x39 the same as a .308? - Quora
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7.62x39mm Gel Test - 7 Loads Put to the Test - Firearms News
AMMO] Golden Tiger - 1000 Rounds of Russian 7.62x39 FMJ BT 124GR - $190 + 22 S&H (.21/rd shipped) : r/gundeals
7.62x39 Ammo - Bulk AK-47 Rounds for Sale at Widener's
5.45x39: Small But Perfect, A History of Development (Part 1) -The Firearm Blog
Russia's Greatest Round: 7.62x39 - Guns and Ammo
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