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I just picked up an AR on trade yesterday and have a basic (probably stupid) ammo question. It is marked for 5.56mm. My question is are 5.56mm & .223 one in the same? Or do I need to use only 5.56mm ammo?
 

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gstiegeljr said:
I believe you can shoot 223 ammunition out of a rifle chambered for 5.56 mm, but not vice versa.
that is correct
 

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While there are some minor differences in chamber/cartridge dimensions, my AR15 (Bushmaster CMP) and my Ruger Mini 14, will both digest 5.56 milsurp and commericial 223, without any problems.

I've shot several kinds of 5.56 in the Ruger for years. It also likes bulk pack Ultramax 223 ammo, which is all reloaded in military Lake City brass. So is Black Hills ammo, if not mistaken?

I would contact the manufacturer of that AR, to see what they say.
 

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Not to hijack this thread but does "I believe you can shoot 223 ammunition out of a rifle chambered for 5.56 mm, but not vice versa." That same satement apply to the 7.62 NATO vs 308?
 
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