Concentrate on cow calls to start. I have tried bugling and about 90% of the time the bull will turn around and run the other way. Out of the entire rut last year only three bulls I bugled to came in. Granted I am not a perfect bugler but I am to the point where I will only bugle to locate bulls or if I am very close like 100 yards away from a very excited bull. Boy is it exciting if you do get them to come in bugling but cow calls have seemed way more affective at keeping them from being suspicous.