California is crazy.
You used to be able to shoot anything you wanted when I lived there.
I remember reading about two teenaged California boys who made some forestry people mad at them by paying $30 or something for a mail-order Boyes anti-tank rifle (British, either .50 BMG or 20mm caliber) and shooting it in the woods. The weather being dry, the muzzle blast started a brushfire in the leaf-litter.