Basically he made ethical kills less likely.

 

There are 8 counties already in California that ban lead ammo and this ban can be lifted if the Fed ever bans non lead ammo. Also, this doesn't go into full effect until 2019

http://www.recordnet.com/apps/pbcs.dll/article?AID=/20131011/A_NEWS/131019977

He says the bill protects hunters by allowing the ban to be lifted if the federal government ever prohibits non-lead ammo.

The ban will be phased in by July 2019. The new law requires the state Fish and Game Commission to enact regulations by July 2015, which will detail when the ban goes into effect for different types of hunting and areas of the state.

Brown said in his signing statement the time between adopting the regulations and requiring the ban to be in full effect will give hunters time to adjust to the new rules. He also said he will direct officials to consider incentives for hunters to make the transition