I've been meaning to try it but never got around to it. Why would someone have to be brave or death defying to try it? Cowboy action shooters load black powder shot loads all the time. Black powder is very low pressure, just dirty as hell.
There is black powder load data around for 1oz loads and I was going to put the slug in a wad cup with the rest of the wad cut off, fill the empty space in the hull with fibre wads (I have a bunch for conventional reloading), and give it a try with FFg.