Seinvocc

Looks good enough. Mantra is usually listed to be used before approval (i.e. the exact phrase that you say for each), but you gave relative time frames for them, so it's good enough. I would recommend some proofreading so that people can read this without straining their eyes, though.

Update approved.

I just noticed that you called it a "magic" cost, not a mana cost. Specify what you spend, and the changes will be approved.

Are the explosion sizes expressed by diameter or radius? Either way, the explosions are of significant enough size that you can be sure that the power factors will be quite low.
You didn't write Thundara out...

"casting methods"
You can't just say that you cast Fire or Thundara. There are different versions across the FF games, not to mention alternative methods. Do you shoot little orbs of elemental magic out? Do you detonate them so that they burst outward in a small area from the centerpoints of enemies in the targeted area? What's the range/radius of each? Et cetera, et cetera.

Better, but you need to specify the incantations and casting methods.

Start with less ammo. Also, you don't need separate numbers for how many you have total and how many you have excluding loaded shots.

Specify the available spells. The phrase, "stuff like Esuna and Fire" = not specific enough.

What's the firing rate? Are they of the same power factor as typical guns for chars?