Trying out a load for 11/8 handicap loads and it calls for 20 grains of green dot. The bushing called for in the chart is suppose to load exactly 20 but is consistently dropping over 22. Had to drop down two bushing sizes to meet the weight. Also got very inconsistent drops with this powder as compared to clay dot. We confirmed the results with two different scales. Anyone else have problems with this powder doing this? I know powder lots vary but two grains?