@vitruviansquid

I agree that caliver is probably not the right word. It's pretty specific to late 16th century england and for the most part was just another word for arquebus.

do you have any specific sort of time period in mind for your firearms? If you're looking for one where a period were firearms don't really dominate the battlefield you probably want to look at examples from 1400s or earlier. You'd have a pretty wide variety of different sized cannons, swivel guns, "hook guns", and simple handheld guns (some of which might have started to use simple matchlock mechanisms).

You also might want to look to ming china for inspiration since they tended to be the leading user of gunpowder weapons until the mid 1400s or so with around 10% of the army armed with fire lances. Some firelances were designed to shoot projectiles and be reloaded while others were designed to be a sort of short-ranged flamethrower. They also made very heavy use of gunpowder in the form of fire arrows, firebombs, rockets, explody bombs, even landmines.