A wingbone, IMO, is the most realistic sounding call that you can use. In my experience, a pressured tom will answer a bone when he won't answer any other call. I hunt public land in SE Missouri, and they get tons of pressure from guys just riding around messing with them before season.
I have a matched set of wingbone's that I had made. They are the small wingbone out of a hen, and the barrel is walnut turned on a lathe to match the old turpin call barrels.