At one point it was pretty common for farmer's guidebooks to include recipes for explosives that could be used to clear land (e.g. boulders).

It's fairly common for tannerite to be used for target shooting.

Gunpowder is commonly available for reloading.

I doubt this is common and should probably be illegal if it isn't already because it's horrible for the environment. However, blast fishing is apparently actually a thing! https://en.wikipedia.org/wiki/Blast_fishing