Each headstamp or even lot number can be different length, especially new, out of the bag brass. I (being a reloading instructor for some years) stressed segregating brass by lot or by headstamp at least. When I was competing, I would buy brass in 1000 round lots and still had to tweek them to get them all the same size.Thank you for the tip, some how 1st try I got 2.23 with the seating die so a quarter turn and it was set.