If it is a Colt, it is most likely a 5.56 chamber.
Even their "target" rifles have 5.56 chambers. (Modern ones anyway)
I wouldn't worry about it.
Worst thing that would happen if you shoot high pressure 5.56 in a tight .223 chamber is you "pop" a primer back into the trigger group and it locks up your trigger.
It won't blow up or anything, there isn't that much pressure difference between them.
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Good luck.
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