A fellow who worked at the sporting good store in Terrace, had a number of paper 'bags' of ICI 1F- the stuff that was over 1/8" in diameter, most of it smooth and oblong kernals of powder, not angular in any sense of the word. We called it cannon powder. As no one would buy it, he decided to 'blow' them up.
The gist of this story, is that he set them on the 100 yard target stand and 'blew' them up, one shot at a time with a 7mm Rem mag. - 150gr. It appears a 150gr. bullet at over 3,000fps can ignite them. Each bag burst open into a huge white cloud of smoke - no exploasion, per se`- just Whoof!