Close-in magazines and the last leaker

For the close-in system described as hitting inside 1,500 yards, how much ammunition is available and how many threats can it defeat?

A limited magazine serves the last-leaker role. No ammunition count or number of kills is supplied.

The system is placed at the final stage of defence against a leaker that has passed the outer layers. Available ammunition is characterised as limited. The requested magazine figure and number of kills per load remain unspecified.