If blasting powder is tumbled, it is just for a short time to knock off any sharp and long projections. The Black Powder formula is the same. The graphite is not part of the basic Black Powder formula. Graphite does act as a burn rate modifier. The trace of graphite slows the burn rate slightly.
Grain sizes are different for sporting and blasting powders.
Except where noted in inches, the screen sizes are in wires per inch. The higher the mesh number the smaller the opening size. For a given grain size, blasting powder burns faster than sporting powder. Blasting powder is less dense due to the more irregular shapes occupying more volume for a given weight of powder. Due to the rough shapes, blasting powder also has a larger surface area for a given grain size.