You do need a powder scale for the Lee Pro Autodisk. I just set up a Pro 1000. The 0.53 disk loaded Bullseye consistently at 4.6 gr rather than the 5.0 in the chart. I switched to Unique and found that the .57 disk consistently loaded at 4.0 rather than 5.2 grains. I then checked the Lee website and found out they had a problem with "fine" powders like Unique. Looks like the right disk may change by powder type.
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