So For 4 seconds harpoon could be far 1000 meters from 35mm shrapnels. Couldn't be ?
Just a guided missile could catch such an agile target. Or the target should be closer than 4 km if you want to use auto cannon.
According to internet sources Phalanx bursts 100 ammunition for an engagement however we don't know Korkut/Gökdeniz how much bursts?
Yet loading is difficult, phalanx has 1500 rounds. Again we don't know about ammunition capacity of Gökdeniz either feeding system.
Edit : phalanx is reloaded in 5 minutes.
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www.navylookout.com
Please notice, Apart from subsonic Harpoon / Exocet, we havent started speaking about old gen supersonic Soviet Anti-ship missiles that Egyptians have.
And what about new gen supersonics such as Brahmos?
In order to enhance the mobile penetration ability of anti-ship missiles, according to the anti-ship missile and the ship to air missile combat process, reducing the interception probability of ship to air missile weapon system, the construction of spiral maneuvering anti-ship missile...
www.semanticscholar.org
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Thus we should assume that against cruise missiles, anti-aircraft auto cannons, Gatling guns are inefficient further than 1500meters.
Those systems could be effective against mortars, artillery rockets, drones at 4 km but except cruise missiles that can maneuver.
Then why would you waste too much powerful cartridge, and sacrifice big space for it?
Less powerful programmable ammunition could also do same job.
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Now i can understand why Rheinmetal metal revealed new 30mm cal millennium gun.
By Paolo Valpolini “The Nagorno Karabakh conflict has shown a series of gaps in air defence assets,” Fabian Ochsner, Rheinmetall
www.edrmagazine.eu