Think of the period people call the " Golden age of piracy " There are gunpowder based weaponry such as cannons and gunpowder pistols. With the addition of magic gunpowder weaponry is much more versatile. If one can find the correct mage willing to help, or IS the correct mage, they can enchant the normal ammunition to grant added effects. Think slightly more advanced than medevil. I would not know the DnD era cause I really don't play DnD.