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Not sure if this is the right place to ask this question but here goes. Can anyone explain the differences between a 5.56 and a .223 and address any safety issues or function problems when shooting them from from either rifle chamberings? I thought they were the same with the only difference being a military designation being used for the 5.56 relative to NATO ammunition markings and use. However, I have heard that rifles chambered 5.56 can shoot a .223 as well. But, a .223 can not handle a 5.56.
 

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u can shoot 223 out of rifle chambered in 5.56. but not 5.56 out of 223 .the 5.56 has higher pressure and the casing is little diff.
 
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