I killed a NM Gila bull at 8AM on the very 1st day of the season a few years back. He was super mature, all by himself and responded aggressively to a few discreet chirps. Just like in the Primos videos, but better, since I was the one killing him!
Hunted opening week and heard bugles right away. The bulls are just starting to round up cows. I did see some bachelor groups also. Saw some spikes with cows, so they're not getting chased away yet. I was able to talk to a few bulls but they had cows with them, so they wouldn't come in. All in all a great trip even though I came home elkless.