The following description of Cowboy Action Shooting is compliments of John Scott a.k.a. Santee SASS #2171
Hole in the Wall Gang:
Cowboy Action Shooting is a competitive shooting game where the shooter and/or the target are moving (unlike standard target shooting).
The course of fire is based upon a scenario, or story, that determines what combination of firearms the shooter will use and the layout of the targets. The targeting changes from scenario to scenario, offering variety and challenge that enhances the fun.
The firearms used are based on those which existed in the 19th century American West, i.e. lever action rifle, single action revolver, and shotgun.