It doesn't shoot flat, but inside 200 yards the 7.62x39 might be the ultimate battle round.
The Ultimate Rifle: Russia Is Building a Deadly AR-15
New Russian SR-MP “Vikhr” Submachine Gun. A 7.62X39 mm necked up to 9mm for a subsonic 260 grain round. : r/guns
Ruger Mini 30
Russian ammo ban loophole keeps it in US, splits gun groups on Ukraine
Best AK-47 Ammo: 7.62x39 Steel VS Brass - Wideners Shooting, Hunting & Gun Blog
Anton please: under appreciated Russian guns collection vol 1: AN94, AEK971, VKS94 and a couple TKB prototypes including a three barreled bullpup. : r/H3VR
Neither rifle nor machine gun: the RPK-16, Russia's new light machine gun
Russia's Greatest Round: 7.62x39 - Guns and Ammo
Ruger Mini 30
223/5.56 vs 7.62x39: What You Need To Know
Russia's Greatest Round: 7.62x39 - Guns and Ammo
7.62x39 AP/API opinions? - General Ammunition Discussion - International Ammunition Association Web Forum
TRUE NORTH ARMS] 😍 GUN & AMMO DEALS! : r/firearmdealscanada
Spec Ops Doctor: Rather Shot With AK-47 over M16 -The Firearm Blog