The elk generally start bugling in the second week of September, in the third week its the peak of the rut and the bulls are going nuts, and in the fourth week of september and early October there is still some bugling because some cows have come into heat late. If you want intense bugling action go in the third week of September and you'll have a good chance of calling in a bull with a cow estrous call or a spike or raghorn bull call. Remember, don't sound like to huge of a bull or else you will intimidate bulls to come in. Try to sound like a raghorn or spike bull and you'll call a ton of elk in. Use an estrous cow call because it really makes the bulls come expecting to find a hot cow and using a montana decoy of a cow elk can help that bull come in the last few yards.