F-35 25mm cannon 180 round ammo load too low?

http://www.aerospaceweb.org/question/planes/q0163.shtml

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It looks like either 180 or 182 rounds for the CTOL variant and either 220 or
225 rounds for the gunpod for the CV and STOVL variants. 4,000 shots per
minute is 66 rounds per second which gives the CTOL variant 3 shots with the
gun and the CV and STOVL variants 4 shots with the gun. I'm no expert, but to
me, it seems like a kinda low ammo supply for a close air support aircraft.
Anyone agree? Disagree? Since the program is still in early stages, is it
possible the ammo load would be increased?

Thanks