Alright, the problem I'm seeing is that when the glass dust is activated, it would stay at the same size. It could only expand by increasing the bullet's volume, which is by heating the glass to a certain point. Even then, that's volume, not mass. It wouldn't do more damage, instead it'll be weaker.
Of course, I'm intending for Sovereign to block the bullets, but I'm nipping this future problem in the bud, as well as offer a few advice. Other dust would function a lot better considering the elements they provide. Glass... is just glass, and would probably only serve to be a poorman's shotgun blast for any other weapon.
I honestly don't care as to whether or not this advice is heeded in the tournament, so the match is still going to go on, unless you say otherwise.
Now that I'm done bringing this to your notice, I'm off to post in other things before checking for your answer.