the elk aren't going to be sleeping much during the rut. if they have a harem then they are going to be herding them 24-7. they're gonna be screaming, rutting, fighting 24-7 trying to keep the cows. as said above your guide should be able to put on quite a few bulls unless you shoot the first one you see. i wouldn't worry about the moon but would go out and get in the midst of them and have fun, enjoy the scenery and shoot the one you want or the next one...