Another technique, which is actually very effective during the spring and fall is to pattern them. They aren't as predictable in the fall as the spring because there is more food around, but still have ruts that they get into. As I sit here typing I am watching 2 big gobblers that got lucky this spring, yesterday there was a bearded hen behind them. The toms come out every day, morning and night. One of them will find a broadhead this fall. I shot my 2 this spring both over 25 lbs, and one with a very thick double beard (8 and 10"). They both came in to calls gobbling there heads off, but I had a pretty good hunch that they would be coming.