Using the 80.75 ft/s/grain from that data gets us to just under 1950 fps for a 22" tube. Closer to 2000 fps from a 24" tube. So it's suggesting QuickLOAD missed by 200 fps. Always possible until you've verified a powder lot match. QuickLOAD's data is all based on testing just one lot of powder at some point in the past, and if the powder distributor's manufacturing source has changed over time, the model can be off. The lower velocity brings the expected drop closer to slightly over 9", though.
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