Are you talking about in general or specifically about Cali schools and Calimresidents. If in general I don’t know but lots and lots of CA residents are successful in applying out of state. In state CA schools are very hard to be accepted to because there are so many qualified residents. The exceptions are schools with specific missions(UCR, Loma Linda and maybe a couple of others). I think I read that the premed applicants from UCLA can fill every seat in Cali med schools each cycle.
@gyngyn , a highly regarded ADCOM and professor from California has written extensively on the subject.