I can’t answer your question as I only have ARs with 5.56 NATO stamped on the barrels. And I shoot anything thru them.
In The bolt gun I have in 223, I had load for that gun.
But…when the M193 round was “The” round, people were advised not to shoot it in 223 chambers. The difference is twofold. One, the military measures pressure chamber different than SAAMI does. secondly,the military chamber has a longer leade that is different from the regular 223 chamber leade. That affect pressure also.
But no, the old M193 nato round, once being regulated to the trash heap of history, didn’t magically become safe in 223 chambers.
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I was obviously being deliberately obtuse when I suggested that M193 ammunition suddenly became safe to shoot in 223 Remington chambers when M855 became the “official” NATO cartridge, and didn’t think for a moment that anyone would interpret it differently. What the careful person will say is that any ammunition designated as 5.56×45mm should normally be avoided in 223 chambers, without any reference to the NATO designation. “Shoot only ammunition that matches the chamber designation of your firearm (mostly),” is one of the many firearms safety rules that shooters should keep in mind.
I did, however, learn something with the discussion, and now I will be careful to never again refer to “5.56 NATO” unless it’s the actually the properly-designated round. And now that I know the difference, it will be something else to annoy me when someone else uses it improperly along with the myriad other terms that shooters use incorrectly.
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