Up until recently I had been using a Lyman Headspace gauge to set my sizing die and it was doing OK. I recently bought a Hornady comparator to use on my digital caliper. Have now been using it to set my seating depth as until recently all my brass had already been resized. This time around I had2 boxes of empties that I just shot so I measured them with the comparator and one box measured 1.461" and the other measured 1.162 then also measured a group from my bucket and they too were 1.462" so I decided to use 1.460 as my headspace setback.. As I moved through all this brass my measurements kept moving when I checked lengths from 1.4605" down to 1.4580 So I started checking more before sizing and found more of the 1.461 and even some 1.460.. Now all 260pcs. of this brass has been fired in this gun. Showing a .002' variance. Is that normal? Also I segregated the 1.458 from the 1.460" sized brass. Do I need to do this? Will that much variance effect accuracy? Cause fliers or other anomalies?