Handloads: 7.62x39 mm (Russian)
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".
7.62 x 39 Russian Archives - 1967spud Reloading Supplies Ltd
Caliber 7.62 x 39 (M43) Russian
Moscow Match - RifleShooter
Can you reload a 7.62x39 bullet into a 7.62x54r case to increase velocity at the expense of mass? - Quora
Handloads: .25-35 Winchester An Official Journal Of The NRA
BRASS CASED PPU 7.62 X39 AMMO AVAILABLE NOW!!!, Atlantic Firearms
AR Accuracy with 7.62x39 mm An Official Journal Of The NRA
7.62x54R Russian – Ultimate Reloader
Best AK-47 Ammo: 7.62x39 Steel VS Brass - Wideners Shooting, Hunting & Gun Blog