California already restricts access to ammunition. Only California residents can purchase ammunition in the state, and only after going through a background check. It is also illegal for a California resident to buy ammunition out of state and import it without a background check. It is legal for a non-resident to take ammo into the state, but they cannot transfer it to a California resident, and California residents cannot transfer ammo to them. This creates lots of issues for hunters. The laws are so byzantine that hunting organizations have guides about what is and isn't allowed.[1]

Even though I'd bought multiple firearms in California, this background check always rejected me, probably because my name doesn't fit in their databases. Somewhere between 10% and 16% of legal firearm owners in California are denied ammunition due to this faulty system.

1. https://calwaterfowl.org/navigating-californias-new-ammuniti...