Over the last few days I have heard numerous calls into Lars Larson regarding bullet types for carry weapons that the caller would use to lawfully defend themselves on the MAX. Here's my $0.02 so I can stop screaming at the radio when someone suggests full metal jackets.
I would first point out that the best way to survive MAX violence is DO NOT RIDE THE DARN THING.
Second, every bullet fired, even bullets lawfully fired in defense of yourself and others, has a lawyer attached to it. The prosecutor (hopefully) will decide that you acted legally but that doesn't stop the scumbag lawyers from coming after you in civil court. You DO NOT want to have to shoot someone.
When deciding what hangun ammo to use it's always best to ask the experts: law enforcement. This also relates to point number two I made. If, God forbid, you wind up in court for a lawful shoot it's geat to testify that "I carry Brand X which is what the local PD/Sheriff's office carries in their handguns."
I just realized that this is going to get very long so let me just point you towards a very exhaustive report worth a read.
Best Choices for Self Defense Ammo
Note: Hydra-shoks, full metal jackets and Safety Slugs do not make the list. I'm a fan of the Speer Gold Dot.
And no gun post would be complete without pointing you towards OFF.