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This question has come up before and I asked about it once myself. I specifically asked if I could shoot 5.56 military surplus ammo through my Ruger M77 Mk II bolt-action .223 rifle. The consensus was split so I called Ruger and the Technical Division people told me that it was safe to shoot any milsurp 5.56 ammo through the .223 Ruger (!). So, I sent them a letter asking the same question. I feel that if I get the same answer in writing then I will go ahead and use the 5.56. This stuff is confusing as h*ll!
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