I use 17.2 grains of ClayDot in Remington hulls with 1 oz of shot. I have interchanged any medium primer, Fiocchi, Winchester, CCI, and any WAA12SL wad clone. I have used CB1100-12, Jammer XL1s, and DRA12 1 oz wads. I think the Green Duster would fit in that group, too, as it is listed as a WAA12SL replacement. I am not recommending this, and you should follow a published recipe. Mark