According to the "Northeastern Wyoming Hunting Guide 2010" states this.
"The largest deer herd in the Gillette area also is the largest in Wyoming: Powder River, which encompasses hunt areas 17, 18, 23 and 26. Wyoming Game and Fish believes the herd will be slightly above objective, at about 52,193."
We will be hunting in area 17 for antelope first then if we fill our tags go for mule deer. Unless one gets between us and an antelope of coarse.