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.223 is not 5.56x54

11774 Views 30 Replies 19 Participants Last post by  AquaHull
I have a bit of 5.56 x 54mm Nato penetrator 62gr ammo.

There is a bit of controversy about the difference between .223 Remington and Nato rounds so here is what I know and am ready to be educated from other sources.

My understanding is .223 Remington is loaded to lower pressures than the Nato rounds so you may not be safe firing Guvment rounds through a civilian bolt action rifle.

My other understanding is that in a "black gun" you can fire either .223 Remington or the Nato 5.56x54,

Please let me know if that doesn't compare to your knowledge.
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while the info above is correct - I've always been told to not worry about the difference in any modern firearm that was built in the last decade or so. Now-a-days even your .223 bolt guns, while stamped .223, will handle the extra pressure from a 5.56. If you are really worried, try it, look for any pressure signs - but if your bolt gun was made in the mid 90's or newer you probably don't have to worry about it.

I've (and many others) been shooting 5.56 through .223 bolt guns for years with no issues...
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