In Belgium, firearms and ammunition must be kept out of reach of children and unauthorised persons and stored in such a way that a firearm and its corresponding ammunition are not immediately accessible together.
Firearms must in principle be stored unloaded. They must therefore not be stored with a cartridge in the chamber or with a loaded magazine inserted in the firearm, except where a specific exception is provided for by the regulations.
Ammunition must be stored sufficiently separately and securely. A separate compartment or a separate secure storage area can, for example, help ensure that the firearm and its corresponding ammunition are not immediately accessible together.
Official source – FPS Justice (Dutch)