IMO I wouldn't attempt to call, especially if your area has any decent hunting pressure. He is likely to have been grunted at already this season and I wouldn't risk him being wise to the game. I see no problem at all with putting some corn out, but my thought is that if you figure out the trail he is using on a regular basis, maybe you should try setting up further up the trail to catch him a few minutes earlier. I have seen numerous pictures of bucks sparring over corn, but I am not so sure it represents the dominant display as much as we are used to thinking. I have seen little six pointers continuously spar with massive ten pointers without mercy. I believe the sparring is more due to proximity and one deer telling the other to get out of my face while I am eating. I don't think a grunt is going to send any buck rushing in to defend a corn pile.