I find bulls are easier to hunt in the early season, when the cows are in harems. Finding a satelite bull won't fill your tag. When the harems break up, cows are much easier to find. Recognizing the bugle of a herd bull is key to moving in on a herd. Spending valuable time stalking in on a puny bull with no harem will get you nowhere and burn valuable daylight. I ain't 100%, but I can usually tell if there's a harem around from listening to a bull. Smaller bulls always seem more anxious toknow who's there.