Attached are my loading cards for 28ga AAHS hulls 3/4oz lead at 1200fps based on Hodgdon and Alliant data. You will need to verify from their data and take note that I interchange Cheddite primers with the Winchester W209 primers; there’s likely separate entries and data for each of those primers. But this data should give an idea of what to use for lower pressure and lower velocity load. No 20/28 to be found.
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