223 ammo test. If you want to fire 5.56 NATO ammo through your .223 chamber, proceed carefully and watch for any excessive pressure signs. If you’re buying a new gun or barrel, you can eliminate any ...

Two of the most popular cartridges today are nearly identical and sometimes considered transposable, but when looking at 5.56 vs .223, there are some key differences. The .223 Remington started as ...