So I have only been reloading a few years and always Full length size my brass. I have read about how I am probably over sizing it and I need a gauge to set up my dies so I'm only bumping the shoulder 1-2 thousands. So I bought the hornady set that fits in my comparator and measured my fired brass then set up my dies like I always due so shell holder fits flush to dies then I rechecked and sure enough it was a .002 difference. So I try multiple calibers and set up the same way as I already do and each one is perfect. .002 shoulder bump. So if I were to just set up how the die manufactures recommend its a non issue. Is this normal? If yes then whats all the fuss about with shoulder bumping. Is it just busy work?