Headspace difference between .223 and 5.56 5.56 GO 1.4646 .223 Remington GO 1.4636 EDITED TO ADD: In some of the shared versions of this posts, Facebook users are disagreeing that .001 makes any difference. I encourage those who disagree to hear me out. The T.D.P. and Colt 1.4646 Headspace specification is done for a reason. I have observed short headspace make a difference many, many, times with reliability, and accuracy when you feed FACTORY loaded 5.56 pressure ammunition into a 1.4636 chambe
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