A more unique Ammunition System.

I really like this idea, it would definitely make it more interesting, especially if the Revolve skill can be used in combat to randomly change bullets with a cooldown. It kinda builds more on the gambling aspect of pirates, like the dice skill.

And I wouldn't say it's overpowered, i'm guessing that getting a 20% Boss Damage, 6% total damage bullet would take some pretty rare materials.
Though I would say that the Attack bonuses are laid on pretty thick. A Master's Cartridge with 6 Red Gunpowder 4 would be a total of 78 attack... which is a lot for an ammunition to have.