Final Fantasy XIV Database - Ffxivpro.com

If you ask me COR/WHM is a waste unless you're in a manaburn party where gun shooting is futile. WHM is a good subjob to have available should you run into a situation where your gun's damage resistance would be too high to be worthwhile or when extra cure 3s and status removal is vital.

But in all honesty, with the right gear and decked out merits, a COR can shoot almost as good as a RNG. Just wish they had access to more/better guns =/