The modern gunpowder people use today for their ammunition’s is called the smokeless powder. It is a nitrocellulose based mixture that can be based on a single or double mixture. These are very flammable and may def-lag rate quickly even in normal situations.
Typically in north western countries, persons can store smokeless powder weighing up to five kilos of mass gross weight, and can only be kept if staying in an attached house and if the storage container is more than one kilo.
People are also allowed to store 20 kilos in mass gross weight for usage in attached dwellings if they are kept in a container weighing less or equal to the mass of one kilo.
How to Store Smokeless Powders:
First and foremost smokeless powder should be kept farthest away from any substance that can ignite or start heat or fire friction. Those who are not authorized uses should not be granted access to any of these powders even the cartouche.