Dick, JD, I have several of those bodkins from the same supplier. If you want to use them for anything more than clout shooting forget it. I've broken the piles off the socket just sticking them in the ground. They look ok but they aren't for serious shooting.
The medium ones average about 350 grains or so. The heavy ones go from 400-600
The large or heavy bodkins can be flush mounted on a 1/2 shaft. The light bodkins will fit flush on a 3/8 shaft.