I think the key to getting a buck to come to a grunt call is having a decoy for him to connect the sound with. I have had deer look my way when I have grunted, but they have never came in. I think they decide to keep moving if they don't visually confirm the other "bucks" presence. This is just my theory. I haven't used a decoy before, but I will be using one next year! Also, if you hear loud grunts and don't see the deer, it's probably another hunter!

Graham Outdoors