In my experience, use an elk call no one else uses. Elk begin to associate various sounds with humans. The Hoocie Mamas are great sounding but everyone I see where I hunt has one. They still work, but you have to be careful. I have found that cadence or rythm is mor important. Wild elk dont always call in sets of 3.
Bugling still works, but it seems out here its only for a week or so in the heat of the rut when the respond agressively. the rest of the time they only squeal, or sneak in quiet.
This year we literally stumbled onto a herd that haddnt been hunted. I made one cow call and 6 bulls bugled. They would come in partially, and look for us. This went on for 6hrs. Obviously we found a herd with a Herd bull and a bunch of satellites. At times we were 15 yards away and could not get a shot due to the thickness of the brush. We could see hooves ad antlers, but no vital areas.
The kicker is that this spot is less than a mile from a main road, and about 300 yards of a logging spur. Sometimes the thronging hordes drive right by good spots, and will push elk into unlikely places.