The rut is petering out by the 20th of September. So the bulls git rutty in spurts. One day, a bull will leave a harem to chase off an intruder 200 yards away, the next day you gotta get within 50 yards before he' ll come yer way. Then, some days he may jus' move his herd over a mountain rather than come to a call. Hard to predict what they' ll do til yer in on ' em an got ' em talkin' .