I used to live at Tac City but lately I've been on a more firearms oriented trip. Lack of time due to work OT from hell. But I'm in MPK.
LA Gun Club range rules stipulate you must not collect brass there, all brass is their property. (This is because they want to sell their ammo and do not want to lose the brass once shot).
That being said, if you shoot exotic calibers that they do not sell there, and want to pick it up for your own use, you can let them know and they are generally cool with that.