Biven Chapman of Larkspur, Colorado might look like a meek 16-year-old girl. That changes the moment she mounts a horse and holsters a pair of .45-caliber pistols. In rapid fashion, she can gallop around a complex course of balloon targets, blowing the bejesus out of each one. 

"It's pretty cool," she said. 

Chapman is an up-and-coming cowboy mounted shooter. The competition pairs barrel racing with target practice. Riders are timed as they run one of fifty patterns in a rodeo arena. The winner is the rider who can dispatch ten balloon targets in the shortest time.

De Chapman takes aim and fires at a cowboy mounted shooter competition. 

(Photo courtesy of De Chapman)

​The Cowboy Mounted Shooting Association, which organizes the events, says it's the fastest growing equine sport in the country. Their next events are Saturday and Sunday at the National Western Stock Show in Denver.

Biven Chapman plans to compete along with her mom, De Chapman, who got her involved in the sport. Both joined Colorado Matters host Nathan Heffel to explain the rapidly growing sport and lay out their expectations for the competition.