I graduated from Cordova HS in 1982. I've seen the deer rifles in the pickups many times.
When I was in high school in Northern California in the early 1960s, probably 40% of students drove pick-up trucks (or Rancheros or El Caminos) at least part of the time, probably 75% of those had gun racks, and most of gun racks had a couple of guns in them — most common combination was a 30-30 (often a Winchester M1894) and either a 12 or 16 gauge pump shotgun. Various varmit rifles were commonplace - I don’t think I knew more than a handful of kids who didn’t at least plink with a .22.