Thank you all for your comments. I guess we will have to see how good my approach skills are on a late season bull. My wife and I regularly shoot out to 500yrds, and we play at further. I guess my concern is not being able to make the shot, but whether we have enough energy for a quick clean kill.
We will brush up our shooting skills, and work on our stalking. And scouting. If the only shot we get is with the camera, the hunt will still be worth it. I don't want to take a risky shot and potentially wound an animal, as that will make this, my wife's first big game hunt, her last.
Thank you all again.
Creedmore is fine at 500 yards if you can shot.
https://youtu.be/IOo6gprtKeA