Basically cannot be 'unsupervised', which is not actually defined anywhere so open to interpretation. If you can sit by the window and park where you can see the car I'd say its clearly supervised, if the car is alarmed and you can hear it... maybe? Its a grey area AFAIK.
Personally if I'm going to be away from the car for more than just paying for petrol etc I generally have the bolt separate and slip it into my pocket anyway, even when the car is locked/alarmed. Doesn't take much effort and its another layer of security. Obviously not such an easy option for firearms without easily removable bolts though.
The magazine thing also seems to be a grey area (when not installed the magazine is probably not part of the gun? especially if you have another empty magazine installed) but it doesn't really take any effort to load a magazine when you reach the hunting area rather than before going there so why risk it.
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