I shot a carp deer and we went up next to it and laid our rifles and packs down. The deer got this wild eyed look and tried to get up in the direction of our rifles. He trampled them and then died. Scared the piss out of us at the time. Looking back on it it is a cherished memory of hunting with my father.
My furthest was 478 across a canyon. There was no way to get closer. Average shot is probably 300. This is with a 300 Win mag.
Remember, A little meat is better than no meat at all!!!!!
I have glassed a fair number of cats in central to southern AZ. I have killed two this way and shot at two others. This is the extreme of hit and miss glassing. The first cat was a 160 pound tom from unit 33 and the second was a 125 pound tom from unit 27(this year). Unit 24a would be another good choice. Good Luck! It will be tough, fun, and extremely rewarding if and when you kill.