The Tribune has an article about new regulations on shooting in Colorado
Shooters must use cardboard, paper or manufactured metallic targets or thrown-type clay targets while shooting. They also must not possess an open container of an alcoholic beverage as defined by state law.
The new regulations were put in place to address concerns by residents and officials who were not only worried about stray bullets flying over private land but illegal dumping providing targets for shooters.
Those hunting with a license on the land are exempt from the new order.
So, hunting with an open container of an alcoholic beverage is OK? That seems random.