Re: Firearms in fantasy?
In a fantasy game, there's no need to follow historical events too closely.
For instance, here's an idea I had---some mages have been trying to "distill" pure mana. They have gotten impure mana, which seems to have little use. EXCEPT is goes *BOOM* quite nicely. Strange but true; concentrated mana is explosive!
Well.....that's what the people in the game world think; in fact, they've managed to distill a little bit of mana, mixed in with some carbon, sulfur, and saltpeter. Since there *is* detectable mana in there, everyone thinks it explodes due to the mana, rather than the "slag".
Thus, no-one realizes that the way to improve the gunpowder is not with magic. So, the powder is very poor quality, takes a very long time to burn, and should be used with 2-3 meter long barrels---but they don't know that, so they use barrels around 1 meter (for handle-ability) and waste most of what little power the powder has. Ergo, guns are no more powerful than bows.
BTW, gunpowder that had not been corned not only clumped, but was so fine a powder it leaked out of the barrels and formed a cloud around the powder train. A very explosive cloud.