5.56 NATO ammo prices

5.56x45mm NATO is the standard chambering for most AR-15-pattern rifles and many other semi-auto rifles. Common loads include 55-grain FMJ (often labeled M193) and 62-grain green-tip (M855).

5.56 NATO and .223 Remington share the same external case dimensions but are not the same spec. Firing .223 Rem in a 5.56 NATO chamber is generally fine. Firing 5.56 NATO in a chamber marked only .223 Rem is not recommended: 5.56 loads can run at higher pressure, and .223 chambers typically have a shorter leade (throat). Check the markings on your barrel or ask the manufacturer; .223 Wylde chambers are designed to handle both.

Listings are sorted by cost per round with in-stock offers first, and each one shows when it was last checked. D.O.P.E. price history helps you tell whether a bulk case is actually a good price right now. .223 Remington has its own page.