Lee chart
I have found the charges vary from the provided chart as well. I imaging it is from variances in the manufactured disk. What I have done I purchased several spare disk and modified the chambers by sanding them slowly till I got the desired charge. Also I would try going up one size on the disk or so. It seems to be light but consistent so try a bigger charge setting. Also +1 to the above mentioned adjustable charge bare it is priceless when working up a load. Yet I prefer the fixed disk for production loads.
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