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.223 is not 5.56x54

11775 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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I have always wondered about the differences so this is a great post. Does anyone have any informed thoughts on firing 5.56 in single shot weapons. I have an over under .223/20 gauge and a single shot H&R .223. Both are very robust rifles but if it is creating too much pressure I don't want that.
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