Have you had any exessively dirty guns or failures because of "dirty" powder? I have been reloading for a few decades and found most powders will "burn dirty" when loaded near the bottom of their charge/pressure range. And I clean my guns after each range session, the indoor ranges have wash rooms so I can wash my hands, I take water and rags when I shoot up in the hills and my fange bag normally has rags/paper towels to wipe my guns if they get "too dirty" when shooting , and I don't wear my white tux or white kid skin gloves, jes jeans and an old sweat shirt when I go shootin'. But long ago I started choosing components for how they will perform for me (it seems like recently, like in the last 10 years, newer reloaders are overly concerned about how "clean" a powder butns rather than how well it works). All that to say, I don't know any "clean burning" powders...