
Ceruleum isn't just found in the Empire. Northern Thanalan has a large supply (the largest in Eorzea, if I recall correctly) of Ceruleum that is exploited by Ul'dah. There was a post somewhere in this forum explaining what Ceruleum was and how it was used (I can't find it, sadly), but the short version basically a refined form of aether. Aether is what is used by spell casters (and non-spell casters, too) to shape magical spells. So indeed, Garlean technology is basically magic. Hence the term 'magitek'.
It's very hard to determine what is realistic (realistic for Eorzea´s universe, I mean) and what is just the 'Rule of Cool' or a balance made for gameplay's sake. But if we consider that gameplay is informed by the story, it does appear that a Garlean 'bullet' is as damaging as an arrow. And if Musketeers are going to be the next class (as rumors say), then any bullet will be as damaging as an arrow.
For this reason, I'd say that Garlean weaponry is just if not more powerful than gunpowder weaponry, which is just as powerful as non gunpowder weaponry.
So...yeah, I'd say we leave it at 'Rule of Cool'.
It's very hard to determine what is realistic (realistic for Eorzea´s universe, I mean) and what is just the 'Rule of Cool' or a balance made for gameplay's sake. But if we consider that gameplay is informed by the story, it does appear that a Garlean 'bullet' is as damaging as an arrow. And if Musketeers are going to be the next class (as rumors say), then any bullet will be as damaging as an arrow.
For this reason, I'd say that Garlean weaponry is just if not more powerful than gunpowder weaponry, which is just as powerful as non gunpowder weaponry.
So...yeah, I'd say we leave it at 'Rule of Cool'.