The game wardens I have been checked by have always used a magnet. In some of the areas I hunt, we occasionally get passing shots at sandhill crane and geese, so I frequently hunt with steel. One day I was able to take 2 pheasant, 2 geese, and a sandhill all while working a 100 acre field. I typically carry larger steel shot (BB, BBB) for the crane and geese and smaller steel shot for the pheasant and just switch out. It all has to be steel though as you cannot have any lead in your possession if you are hunting waterfowl at all.
What I find interesting is that you are allowed to shoot sandhill crane with lead. It is only migratory waterfowl that you must use steel (or non-lead) on and a sandhill is not considered waterfowl. The crane can and do use the same roosting and feeding areas as geese, but as long as you are only hunting crane you can currently use lead. It doesnâ??t make sense to me, but Iâ??m not complaining.