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I, too, use the Pro Auto Disc measure and find it VERY consistent. It is not exactly in tune with the Lee Modern Reloading charts. That is fine. I have found which disc cavity throws the proper weight of the few powders I use (WIN WST or 231 and maybe later Autocomp).

One suggestion I will make which has helped me is to make index cards for each bullet weight you are reloading. On put a description of the caliber, bullet weight and style, OAL, and then list the various (if more than one) powders and different powder charges that you use. I also list the disc cavity size which actually throws the weight I want. This really saves a lot of time is setting up for each session without having to re-invent the wheel each time.

Another thing which I have found useful and time saving is to use a paint pen to mark the edges of each of the discs with the size of the corresponding cavity. This way, each time you throw a charge and the disc slides forward, the size of the cavity you are using slides forward to be exposed as you dump the powder. This is a comforting confirmation each time and it also makes it easier to change the discs correctly.

I hope you find this useful.