I grew up in the Denver area and attended Denver public high school in the early to mid seventies. In Army ROTC we had mandatory rifle shooting at the school range, and every Denver high school had a shooting range. At mine we had the top small bore rifle team in Colorado simply for the fact that we came to school two hours early and stayed late at least an hour for shooting practice every day.
This was done with supervison from the retired military ROTC instructors, and before any of us could shoot we were given a weapons handleing course and a hunter safety course at the school. Our class "A" drill team used M-14's and we probably had fifty of them locked up in the rifle range. When we traveled to drill team meets we would take the guns home with us so we could bring them to the meet. Some of these meet's were held at the University of Colorado which is now a gun free zone.
I'll bet this doesn't happen today.