Originally Posted by CanAm
If he was on a private range, then he was on a private range.
A public place and a place open to the public are two, totally separate things.
Additionally, a police officer may not force you to stop show safe/legal transportation unless you are physically carrying a firearm in public, and they require a warrant to check the contents of your trunk unless under reasonable suspicion or probable cause. Each locked container (think locked pistol case) requires a separate warrant.
One warrant can cover the entire vehicle and all containers. You don't need a separate warrant for each container if it is written correctly.