In short, it prohibits "ammunition designed primarily to
penetrate metal or armor". Talk to a REPUTABLE ammunition dealer and they will be able to give you guidance based on that definition.
Once again: I am not a CA lawyer. My thoughts on the matter are not meant to be taken as official legal advice or as a definitive interpretation of the law. (I realize this sounds paranoid, but law students need to be REALLY clear when there is an appearance that we are giving legal advice)