Cowboy Mounted Shooting is the Fastest Growing Equestrian Sport in the Nation. Mounted contestants compete in this fast action timed event using two .45 caliber single action revolvers each loaded with five rounds of specially prepared blank ammunition. The Cowboy Mounted Shooting Association "C.M.S.A." has a variety of levels of competition for everyone, ranging from novice levels to the seasoned professional. CMSA Sanctioned events are held throughout the United States and Canada.