Meeteetse,
It is most likely 5.56 NATO. You need to contact the manufacturer of your bolt action rifle and ask them if it can shoot 5.56 NATO. I know that the CZ 527 Varmint can shoot 5.56 NATO and .223 REM, I asked them. I also asked Browning if their bolt gun can shoot 5.56 NATO and they said "no".
Please say hello to my kin up there, the Coble's and the Schlenker's!
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