5.56=higher pressures. Better safe than sorry I think. If is says .223 Rem then only shoot .223 if marked 5.56 then you can shoot both. .223=lower pressures hence safer.
5.56=higher pressures. Better safe than sorry I think. If is says .223 Rem then only shoot .223 if marked 5.56 then you can shoot both. .223=lower pressures hence safer.
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