you can shoot 308 nato in 308win chambers but be careful shooting 308win in the Nato chamber. Nato chamber is longer.
you are not supposed to shoot 5.56Nato in 223rem chambers but you can shoot 223 in 5.56 chambers.
Nato chambers have a different throat configuration than .223rem. 5.56Nato is good for 60000cup where the 223 is good for only 50000cup
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