I don't have any black powder firearms either, but after doing a quick perusal on your particular question, I get the idea that it is done on a fairly regular basis, however the issue is finding the "correct load" to use. As far as I can tell the consensus is that the substitute powders you've listed burn faster & hotter (more efficient) so a grain for grain substitution of the powder isn't a smart idea as you could very easily over pressure the cartridge. If I were in your shoes, I'd check on some of the black powder gun forums, and also find any ballistics charts for both the bullet (if possible) and the powder (manufacturer should have it), start at the low end of your powder load and work your way up to your optimal powder charge. Run each recipe through a chronograph and a good ballistics calculator, and fine tune it as needed.
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