Oh, and, um, you don't need steel for gun barrels or lead for ammo. You'd be amazed what rope wrapped around hollowed-out logs pushing rocks out the front will do. And most cannons weren't made of iron for a very long time because bronze was much less likely to explode on you than iron was. There's a very good reason why early cannon makers tended to also be bell makers.

Connections by James Burke is a good way to spend some down time (book or video, your choice).

Now imagine you have "fantasy technology" like a dragon chained in the smelter or a gnome making orbit on the back of a slightly broken decanter of endless water only to discover the importance of air (but their friends to get to see the shooting star reentering if conditions are right well).

Throughout human history, science has just been a way of finding rules for the magic. If it's repeatable and reliable and commonly available, it ceases to be magic (no matter how amazing it might be).