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Caliber Configuration: How It Got to Where It's At, and Where It's Headed
I've heard that the 5.56 round was designed to bounce around in the body and cause internal damage rather than be lethal on impact. What are some more lethal rounds? - Quora
Military Small Arms Ammunition of The World, PDF, Cartridge (Firearms)
A Military Small and Medium Caliber Ammunition Collection
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5.56×45mm NATO - Wikipedia
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Weekly DTIC: Bill Davis, And The Birth of Small Caliber High Velocity -The Firearm Blog
Bruce Canfield On the Winchester LMR, at American Rifleman -The Firearm Blog
Caseless Ammunition Overview