>Today, it is a specialty commodity with few commercial applications—mostly for rocket hobbyists—but it’s still used in more than 300 munitions, from cruise missiles, to bullets for M16 rifles, to the vital 155mm shells.

I don't know about the others, but M16 rifle rounds don't use black powder, they use modern smokeless powder. By modern, I mean invented in 1884. I would be surprised if any of those other things mentioned use black powder. The author seems to think black powder is all gunpowder but it isn't. Black powder is reserved for old guns that can't handle modern powder that were made before the late 1800s, early 1900s. There is a classification of hunting rifle called muzzle loaders that also use it, but they are niche. It's also used in fireworks, that's why they are so smokey.

When you see a movie where they depict an old battle where there are huge plumes of smoke coming out of the rifles or muskets, that's black powder.

https://en.wikipedia.org/wiki/Smokeless_powder

Here's what black powder looks like when used in a firearm.

https://www.saobserver.net/community/in-photos-monashee-moun...