.223/5.56mm 6.8spcII , 6.5 grendal, 308win are all cartridges that will meet your requirements.. and are all available off the shelf..
personally i would just stick with 223/5.56 as out of the right barrel it can stay sub-moa out to 200 yards..
ronin.
personally i would just stick with 223/5.56 as out of the right barrel it can stay sub-moa out to 200 yards..
ronin.
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