I have no experience with your outfitter, but have hunted Wyoming for antelope a few times, in different parts of the state. I am confident you should have no problem finding a nice buck. If you have access to a range where you can shoot 200 and 300 yards take advantage of it. I have found a 200 yard zero works well for me. Good luck on your hunt!
On a side note Antelope meat is one of my favorites.
