Looks like California is going to want backround checks on ammo purchases too. $50 fee for the backround check. I would guess it's a 1 time thing and then you get put on the approved to buy ammo list. If your not on the approved list then you can't buy any ammo in the state.

http://www.latimes.com/news/local/la-me-guns-boy-scouts-20130530,0,3573485.story