I figured that the lack of an ammo bar simply means the unit has not yet expended any of its ammunition. Or perhaps it has expended all of it's ammunition. The first is more likely though.
Artillery will almost certainly have an ammo limit, as will all ranged units. Maybe a little higher than we have seen in previous games though. After all steel balls and powder takes up less room than arrows.
Like in all games I imagine we can turn the limits off or on at will.
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