Mossy-I rarely use a call except to stop a moving animal. The bulls many times don't bugle here due to the heat and almost always am stalking two or three animals if not singles. I hunt waterholes from 3pm to dark either in a ground blind or treestand and animals come in at dusk. In the morning I leave at dark and set up in an oak thicket that I GPS during scouting. Usually if I hear anything it's a leaf popping off and being eaten. Many times don't hear a thing but spot movement. Use the wind to your advantage. These are very quiet animals if they want to be and if they want to make noise it's a real racket. You keep trying and limit the calling and practice creeping and you will stick that big bull. Good luck.