I think this is correct, but you should confirm first.
5.56 nato runs at higher pressures but IMO its not a big deal in a bolt gun.
More importantly the shell is a hair longer, like a few thousanths or something like that.
If I remember right, a 5.56 nato go gage is the same as a 223 no-go.
A 5.56 nogo is the same as a 223 field gage.
I guess what I am saying is you could set your barrel heaspace for a 5.56 nato and shoot away.
It might work through a 223 headspace, but you would be running it a basically zero headspace which is not good. Not even sure the bolt would close easily. You do not want a pinched bullet !!
If you headspace your rifle for a 5.56 nato you can run .223 through it, its just sloppy.
Certain chambers will shoot both, like a wylde I think. Not sure how that is different from a 223 or a 5.56 nato chamber.
Better confirm all of that before you start trying it out. Dont want to blow up your gun.
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