I may be off in the weeds a bit but I think #1 buckshot you need to cut the petals off the wad and then they should fit 4 to a layer. I may have read someplace about doing a 3,1,3,1,3 stack to get a 1 oz. load. (11 to the oz.) but since I'm just getting into that size shot this is just research reading based but is reasonably fresh in my mind.