I don't know if you have any insta-death spells, but one reason they don't use guns could be because guns are inherently inhuman; someone sat down and designed something with the sole purpose of killing another human. Bows are for hunting and gathering food and supplies, swords are for combat that places both parties as equals and can even be sport, but guns are just cruel.
i love this explanation a lot because it lines up with the whole witch philosphy in tcwg.,....excellent..,..
















