Cordite is, itself, a smokeless propellant developed to replace gunpowder. It was never widely used outside the UK and precious few people today (outside milsurp enthusiasts) would recognize the smell of cordite.
The closest smell that I can compare modern smokeless powders to is English Mustard, if that helps.
Just be sure the range is closed for pulling and posting when you call in sick to work. Again, don’t ask me how I know this but -------------