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I am not advocating that anyone fire any 5.56mm ammo in a .223 SAAMI chamber.
I am saying that annually for the past 41 years I have fired somewhere between 10,000-30,000 rounds of 5.56mm military ammo in .223 and 5.56mm chambers with no ill effect.
Yes, I do own pressure testing equipment and one of my .223 guns is set up with it as we speak.
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