If you can find a tank and somehow climb a tree then that is great or where ive had luck is sit on on a windmill by water as well as a blind. Pronghorn do have short memories and bad depth perception. Most landowners cut a fence short from the bottom up because they cant judge distances well so they will go under the fence. A spot and stalk is awesome, just keep low and stay cover to cover if possible. Like said above you may catch them in the open so long shots may happen. They usually arent as weary as whiteys or muleys until really spooked. as long as you plan your route right you should be fine.
God luck and get you a speed goat so you will be able to say you have slayed the fastest land mammal in north america.
Good Luck,
Colten