Been looking all over for headspace dimensions for 5.56 chambered AR. I measured factory .223 with a Hornaday Headspace guage. 1.45". Just wondering what the minimum and maximum dimensions might be, and can I size on the longer side since the rifle is chambered for 5.56. Right now my resized brass is measuring 1.46". I can set the die a little lower to get 1.45" but it seems that I might be over stressing the brass.