Oh man. I'm NOT the guy you want to ask that question. The powder magazine "building code" is a pet peeve of mine. If you use steel nails, have them hanging inside the box, have a package of primers (face up) open in the box or an open can of powder....THEN, you start throwing hard metal objects into the box, hitting the nails, causing a spark......well.....believe me....It's just better than you're removed from the gene pool anyway.
Build yourself a box. Make sure it won't hold hundreds of pounds of pressure that might cause a detonation..........just in case something did happen....which it won't, but there's no end to the paranoia some people have. Write the required "explosives" on the outside to impress your non-reloader friends (military looking stencils look really cool and will get more ooooos and ahhhhhhs than magic marker) and you're good to do.
Natural Resources Canada are not going to send an explosives cop over to you house to inspect the fasteners in your storage box...trust me on this. They have much better things to do than go snooping around a reloaders tiny stash of stuff. Unless you're doing something to attract attention to yourself (shooting at cars, robbing banks, dealing drugs...whatever) then you'll never have a visit from the police. 99.999999999999999999999% of the cops out there wouldn't know what they were looking at anyway, much less that you didn't use brass fasteners when you built the box. The CFO is required to make an appointment before inspecting your firearms storage, and I'm pretty sure every pound of powder and every primer would magically find it's way into my neighbours garage before the appointment time.
Don't get all hyped up about the whole storage box/powder magazine thing. Unless you have kids with busy fingers who like to play with fire, where's the problem ? Just don't pile a few thousand primers and 10 lbs of powder on top of your furnace to keep it dry (see the part about the gene pool again)
My stuff is on a shelving unit, away from heat, it's cool, and it's dry. The cans aren't contained so they'll just burn (as designed) if there ever was a fire. The room it's all in is locked, and my kids show no interest in my "man cave" anyway since it's completely dark in there unless I'm in there, and there's usually sawdust all over the place.......and putting everything in a plywood box would help with safety.....how ??? Anybody who thinks I'd build a box and be worried about finding "brass hardware" to put it together is sadly mistaken.
I agree. I built it just as much for fun as for the "rules". Plus, sometimes people can be full of spite. I don't want to have someone over for dinner, cook them a bad meal, and they decided to cause trouble for me. Gotta dot my i's and cross my t's.