Schaper, who at 6-1 is the tallest bull rider on the Built Ford Tough circuit, won more than $34,000 during the weekend event.
Finishing second was Brazilian bull rider Joao Ricardo Vieira, the reigning 2013 PBR Rookie of the Year, who earned more than $22,000.
Vieira was the leader heading into Sunday's final two rounds but was bucked off by the bull Iron Man on the first ride of the day.
Former PBR world champ Mike Lee of Decatur, Texas, finished third in the event to remain the season points leader on the tour.
Defending PBR world champ J.B. Mauney of Mooresville, N.C., was two for five on bulls over the weekend, including being dusted by world champion bull Bushwacker in Saturday night's bonus round, to finish 11th in Oklahoma City.