Ammo limits are listed on the unit card. Most of the time, militia is your better choice as they can keep firing for a longer stretch and they're significantly cheaper as garrison. They will actually fight pretty well against a line unit (even trade or very slow loss) if they are dug in or you can get them behind a wall.
Conscripts are good shots, but only for a few rounds. On the other hand, their melee and morale are much better. I usually don't purchase them, even so, but often keep one or two for garrisons in places that may get hit more frequently than others. Conscripts make a good choice for bayonet-work defending the flag of your fort while the militia shoots from the buildings or from reventments.
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