The Wylde slightly altered the chamber dimensions to accommodate the pressures created by both 5.56 NATO and .223 Rem. ammunition. Also, despite the warnings, many shooters freely shoot 5.56 NATO ...

On the other hand, it’s considered unsafe to shoot 5.56 NATO ammunition in a 223 Remington rifle. You see, the 5.56 NATO cartridge will produce about 62,000 psi in a 5.56 NATO chamber, ...

The cost for a box of .308 Win. ammunition varies drastically between $25 and $70 per box with the average price hovering between $35 and $40. This is another category where the .556 NATO gains an ...

On the other hand, .308 Winchester ammo is more readily available; you’ll be lucky to find a box of 5.56 NATO ammo behind the counter at your run of the mill mom-and-pop general store.

Almost every reputable U.S. manufacturer of ammunition offers some form of 5.56 NATO ammo; the same cannot be said for the Russian 5.45x39 mm, so you’ll be hard-pressed to keep an AK-74 properly ...

That, however, includes 9 mm NATO and .50 BMG, not just 5.56 NATO. It’s not enough to sustain the U.S. military during a conflict, however, according to a Government Accountability Office (GAO ...

Scott Pelley at CBS News declared that "the AR-15's high velocity ammo is the fear of ... they most commonly fire the .223 Remington and 5.56 NATO ... .223/5.56 bullets generally penetrate less ...