I tried firing my Ruger Old Army with Trailboss. Every shot was a hangfire, velocity was very low, accuracy poor, and I decided that was pretty dumb. But it didn't blow up, and now I can tell you not to do that and you don't have to find out for yourself. Real black powder is all I will use in percussion revolvers now, it works properly and is way more fun to shoot. Do yourself a favor and stick to the real stuff.