Good advice. For the record, I didn't mix the ingredients dry but did dissolve them in water then cook it to drive that off. My mistake was stopping too soon, before it turned colors. And the video gave me the idea to break it up while it's still hot instead of letting it cool in one big pile. That makes it a lot easier to grind up. I am going to try pressing it into a puck next time to see if I can get the density up. As you mentioned, dextrin works as a binder and so does rice gluetin, at least for black powder.