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Posted: 11/2/2004 11:19:37 AM EST
My understanding (which is probably wrong) is that this is the same. 5.56mm is the NATO designation, .223 is the civilian designation. Is this the only difference?

Just got some 5.56 XM193 Federal ammo for my BM last night...wanna make sure I'm on the right page. Thanks!
Link Posted: 11/2/2004 11:25:51 AM EST
5.56 NATO is not held to the same tolerances and has a higher pressure than .223. An 5.56 NATO chamber is larger than a .223 chamber to allow it to cycle better. It is safe to shoot .223 out of a 5.56 NATO chamber but do not do the opposite as some 5.56 is too long to properly seat in a .223 Match chamber.
Link Posted: 11/2/2004 11:27:50 AM EST

5.56 is loaded to higher pressures and has increased velocities; it might damage a rifle chambered for .223; h/w, a 5.56 chamber will take both readily

look at ammoracle.com(i think)

someone here will provide a link.........
Link Posted: 11/2/2004 11:36:25 AM EST
All questions will be answered by the Ammo Oracle
Link Posted: 11/2/2004 11:58:08 AM EST
Ok, so my BM 5.56 barrel will accept either. So the 5.56 is also hotter ammo. Is .223 more "accurate"?

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