Calling hens is just another tool to get the gobbler in. It has worked for me several times and usually later in the morning. Like others have already said, answer a hen with just a little bit more intensity and emotion. I once called in a whole flock from about 300 yards away in a picked corn field from something I "said" when answering a hen in that flock. She lead about a dozen birds directly to me, even flying across a creek. When I shot the lead gobbler, the other toms started flogging him, walked off, then returned to give him some more. It was an exciting and interesting exhibition of the peck order.