Heavy radar-directed guns against drones

How useful would a radar-directed 88 mm-class gun be against drones?

Useful, but existing 40 mm and 76 mm systems are more practical; interceptor cost should be compared with the damage prevented.

A radar-directed 88 mm-class gun is considered usable against drones, but the answer favors weapons already in production, such as an Otobreda 76 mm or a 40 mm system. A panelist asks what the larger weapon offers over a 3-inch gun. The economic discussion then compares the cost of interception with the damage a drone could cause if it reached its target. It also questions whether a 40 mm or 76 mm round would be much more expensive than the drone itself.