Cowboy Mounted Shooting Association® is the Fastest Growing Equestrian Sport in the Nation. Contestants mounted on horseback 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 (CMSA) has a variety of levels of competition for everyone, ranging from novice levels to the seasoned professional. The Nebraska Cowboy Mounted Shooting Association (NECMSA) is proudly affiliated with CMSA.