From Sacbee.com

But Berg couldn’t buy shotgun shells at his local hardware store in Yuba City prior to a duck hunting trip last month. He was rejected under California’s stringent ammunition background check program that took effect July 1, because his personal information didn’t match what state officials had in their database.
Berg was one of tens of thousands of Californians who have been turned away from buying ammunition at firearms and sporting goods stores, even though they appear to be lawfully able to do so, a Sacramento Bee review of state data shows. Between July 1 and November, nearly one in every five ammunition purchases was rejected by the California Department of Justice, the figures show.

Read more here: https://www.sacbee.com/news/california/article238203004.html#storylink=cpy