I do believe the storage regs state:
If you keep your gun powder at home then you must keep it in a "suitable container", away from other inflammable substances such as paint, thinner, lighter fluids, other ammunition and it can be removed if there is a fire. The container shall not be of steel for iron, it must be kept locked except when being accessed, only gun powder and primers are to be kept in it. Suitable materials are wood and copper. No iron or steel fittings. It must be scrupulously clean. The word "Explosives" in large contrasting letters must be on the outside. A box of 3/4" plywood is recommended. This is what I call the "locked box".
When you are reloading you should be in an area dedicated to reloading, no fumes, matches, smoking, no lights that can cause an explosion. Only 2 kg can be out of the locked box and in the room with you. At the end of the session all the explosives must be returned to the locked box. And you cannot resell or give away these cartridges. If you intend to, you need a license and more restrictions must be met. If you do not follow this you will be liable to be charged with unsafe storage under the Criminal Code.
Also:
Remember to empty the powder hopper on your reloader after every session and put the powder in a 3/4 inch plywood locked box made with brass screws. No iron nails. Put the word "Explosives" on it and keep it away from paint and paint thinner.
If you were to be inspected by the CFO, you could get nailed for improper storage of ammo if your powder is just laying around.
I am going to build a storage box this afternoon. I'm off to purchase some brass hardware now!