Re: Random question..crushing powder to be finer ?
The modern powders are in specific forms, and with specific coatings to control the rate of burn.
Crushing the powder gives the smaller particles a larger surface area in which to give more volume to burn, and <span style="font-style: italic">quicker</span>. The old time black powder consisted of small particles or even in fine powder form, which is why it burned <span style="font-style: italic">sooo fast</span> and makes great bombs.
I don't think there is a way to experiment with crushing smokeless powder and igniting it in a "controlled experiment". You won't have any idea how fast it will burn. The only control you have is the amount of powder in a pile, and standing back with a fire extinguisher, welding goggles and burn ointment.