I've seen lots of pronghorn along the east side of Schells. Typically the animals are in that area between the paved highway and the steeper slopes of the range. There's lots of area over there to cover...and with the rollong nature of the terrain, it could make for a nice spot-n-stalk hunt.
I can say that I havent seen anything very big in that area though. If you are looking for a "trophy class" antelope you may want to look elsewhere.