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Lee's chart used with the auto disk is famous for being on the light side, depending on the powder. For example with Unique powder, you'll likely need to use the hole 2 sizes bigger than the one specified in the Lee chart.
I too questioned the accuracy of the Lee scale because of the chart/disk cavity discrepency, and bought a much more expensive scale. Turned out that the Lee scale was accurate. Now I also have an RCBS Chargemaster 750 digital scale, and all three scales agree to nearly a 1/10th of a grain. I use the digital mostly now because it's so convenient, and just double check it for proper calibration against one of the beam scales every month or so.
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