Vision: Seeing gunpowder is a warning: stop whatever you are doing or have planned to do right away. Handling gunpowder: you are about to get involved in an adventure that is inherently dangerous. See Cannon, Shooting.... Dreamers Dictionary
If you dreamed of spilling powder, or something being crushed into powder, it suggests that you are in a state of mental turmoil due to conflicting advice concerning an important decision. Get away by yourself and give your instincts a chance to work it out.
If you have any serious doubts about your ability to make the right decision, then get professional advice rather than friendly opinions.... My Dream Interpretation