Don't give up. I hit dry spells sometimes and want to pull out my hair. Try a new area and new sounds. Not to offend your buddy, but try it a few times by yourself. You may be calling too often or too loud. Are you using a digital caller or tape model?? You may want to try using a decoy. I have taken a fishing reel with lightweight mono. Run the line over a limb and hang the decoy to where he appears to be standing on the ground. Jerk the line just hard enough to make the decoy jump around. A buddy would work well in this situation, let him work the decoy. I bet you have had predators in close, they just needed something besides the sound to entice them in.