I load 12 ga. on a MEC9000. I was measuring my reloads and found several shells that measured larger than they went in- not much but 2-3 thousand. Most of them were unchanged that is the same measurement after being resized. Is this possible or is it my inexpensive calibers giving poor reading? After resizing most average about 8.07 and have no fit issues with any of my 12 ga. guns.