I have the Dillon equivalent and had noticed the same problem. One other thing to look at is the poise or what ever its correct name is (the thingy that you move to change weight). When set to 0 for the 1 grain portion of the scale, it would sit at different angles. It was in the 0 notch but it hung down at different angles. Once I started making sure that was the same every time, most of those problems went away. So clean and make sure it always sets at the same angle.