Again..I hate to be a killjoy but, reloading 12 ga. steel shells does not pay....they require exp. steel shot, expensive, hard to acquire wads, large charges of special powder...I can get 12ga. steel at CO-OP for $7.99-$9.99.
There is also a cost of changing your machine over to steel shot.IMHO
I have however seen wads and shot at WSS(mail order?)....Ben