Drew, I would suggest that you get your loads directly from the latest Alliant book available on their website. Some of the advice or suggestions on this thread could kill you. The previously mentioned 1950s Lyman book includes loads with twelve or more grains of Herco over what is recommended today. Another poster suggested that 75 grains of Green Dot would be a good starting point. Any load of Green Dot is unacceptable with 1 3/8 ounces of shot, but 75 grains? Better go to the book. Out of curiousity, I will go to my personal load book and find out how much Blue Dot and Herco I used to use for my 1 3/8 and 1 1/4 ounce lead loads.