5.56 vs 7.62 is a battle rifle cartridge debate that every AR-15 and AK-47 owner has engaged in since WWII. Does stopping power matter or is it muzzle velocity?
Caliber Comparison: 223 vs 7.62x39 - Sonoran Desert Institute
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5.56 vs 7.62: Pros, Cons, Ballistics and More
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Rifle cartridge - Wikipedia
5.56 vs 7.62x39 - Rifle Caliber Comparison by
State Your Case: 5.56mm NATO vs. 7.62mm - The Truth About Guns
5.56 vs 7.62x39 - Rifle Caliber Comparison by
History of Assault Rifles and Ammunition -The Firearm Blog