The 5.56×45mm NATO (official NATO nomenclature 5.56 NATO, commonly pronounced "five-five-six") is a rimless bottlenecked centerfire intermediate cartridge family developed in the …

5.56mm cartridges are ideal for target shooting, home defense, and varmint hunting. Their lightweight design allows for quick follow-up shots and mild recoil, making them accessible for …

Oct 30, 2025 · 556 ammo, officially known as 5.56x45mm NATO, is a rifle cartridge developed in the late 20th century for military and civilian use. It is the standard round for the AR-15 and …

Dec 7, 2024 · Get the facts on 5.56 NATO, from its origin and history to its measurements, ballistics, and comparisons to other calibers. The 5.56x45mm ammunition is one of the most …

Oct 23, 2025 · 223 vs 556: What’s the Difference? The cartridge cases of the 223 Rem and 5.56 NATO appear identical on the outside, but 556 cases can have minutely thicker case walls.

Feb 7, 2025 · There is an excellent variety of 5.56 ammo available, which makes testing and determining the best 5.56 ammo a gargantuan task. I recorded over 500 5-shot groups from …

Dec 12, 2024 · Developed in the late 1970s, it serves as a balance between the larger 7.62x51mm NATO round and the smaller pistol calibers, offering improved control, higher …

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Find a full line of 5.56mm NATO ammo from all major ammunition manufacters.