BPI has a whole manual on the sixteen gauge. According to the BPI manual which only uses BPI wads(major downfall in my opinion) you can use the Field commander Z16 wad 1 1/8 oz w/27.5 grains of SR-4756 and a fold crimp. There are others but they all take overshot cards and or extra gas seals.
I load 2.5 inch 16 gauge shells for my wifes Auto-5 and my Springfield SxS. I use Cheddite and Fiocchi hulls with the same load which is:
Fiocchi hulls ,Win209, SG16 wad(BPI) 25.0 gr of Universal Clays and 1 oz of shot. That is our sporting clays load.