Just let him be. Take your time while moving in and wait for each gobble before you inch closer so that you can pinpoint his position and set up undetected. If he goes quiet, but you still need to cut the distance to him, try to provoke a gobble with a soft great horned owl call. If that doesn’t work, ease your way up the volume scale from barred owl to crow call or maybe even barking or howling like a coyote. With hard-hunted birds, that may be used to the same old song and dance, it may take a little outside the box thinking to be successful. Consider what else happens during the morning hours in that area—a rooster might crow, donkeys might haw, cows may moo, or geese might get up for a morning flight.