A comparison of 7.62x39 vs 5.56 - let's look at how the rounds stack up ballistically and what each offers over the other for shooters.
Russia's Greatest Round: 7.62x39 - Guns and Ammo
AR15 300 Blackout Vs. 7.62x39mm
7.62x51 vs 7.62x39 - What's a Better Rifle Round?
223/5.56 vs 7.62x39: What You Need To Know
300 Blackout (BLK) vs. 5.56: What's Best For You? - Pew Pew Tactical
U.S. bullets may be ill-suited for new wars
5.56x45mm vs. 7.62x39mm: Ballistics Match of Tortoise and the Hare - Pew Pew Tactical
History of Assault Rifles and Ammunition -The Firearm Blog
A History of AR Cartridges
5.56x45 Ammunition
5.56 vs 7.62x39: Choose Your Battle Rifle Caliber on Vimeo