I have had much success with grunt and bleat calls. Every year I have hunted I have heard bucks grunt...some more than others and most often during the rut. The buck I killed last year grunted all the way in for more than a hundred yards. I did not call him in with a grunt call however, I called the doe in that he was trailing with a bleat call and he followed her right in. This has worked for me on a couple other bucks as well. I have heard the different types of grunts from bucks also. The tending grunt call which is just short quick grunts to a challenging type of grunt which is awesome to hear...bwaaaaaaaaaaa...gets my blood pumping just typing this. Of all the grunts I've heard from bucks, I have NEVER heard a doe bleat.