[T. O'Heir]

"...through auto glass or even a car door..." That's not a good idea with any bullet. Kill or otherwise damage the driver and you now have an uncontrolled, one ton plus, projectile. Makes no difference if you're a cop or not either.
There's no reason or excuse for shooting at a moving vehicle. Especially with a hand gun. Doing so is irresponsible. Even if the driver is aiming his 1 ton plus projectile at you. You will not stop a vehicle with any firearm. Physics doesn't allow it.
It's got nothing to do with the bullet weight anyway. It's about bullet construction.
"...the FBI's standards..." They're not now nor have they ever been the arbiter of any such thing. They're cops who use what they're told to use. Same as any cop.