I put a Criterion 223 with Match chambering and was a little worried. I loaded some 75 grain hpbt Hornady bullets out far enough to be just .015 off the lands and it shot a crappy 2 inch group at 100 yards. I just forgot about chasing the lands and just loaded to 2.250 the hornady recomended O.A.L. it shot less than 1/2 groups.
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