FYI, it's always the same...
Pre-rut bugling gets shut down mostly (with exceptions) after the Labor Day first week invasion of elk call abuse.
The rut always starts a couple days before equinox- Sept 22- cows go into estrus once the cows start releasing estrus pheromones
Yes, Pre-rut has a chance for a herd bull. Working the wind and not ringing the door bell over and over. You just let them know you are there. If you like hearing bugles as they leave, continue calling.
You can get lucky calling but if you knew how few get lucky...
Harvested a 6x6 336" first hunt with zero calls a few years ago. Qualify by saying " you can call small bulls as their education is growing.
Remember, the big name hunters on YouTube are funded by elk call companies. The elk are very educated now. With exceptions, they will circle to get your wind and while you are not aware.
Lastly, they can rut with limited bugling. Chasing bugles is fun. Killing a mature bull is much more fun but requires more discipline.
My 2 cents