A couple of videos from a The Drive post, “Gepard’s 35mm Cannons Blast Russian Drones Out Of The Sky In First-Person Video.”

TheFlakpanzer Gepard was not designed specifically for UAS. It was designed in the ’60s and fielded in the ’70s to protect against low flying aircraft like attack helicopters and the Soviet counterpart of the A-10 attack aircraft, the SU-25 Frogfoot.

The twin 35 mm guns are much more powerful weapons than the 25 and 30 mm weapons mounted on the Mk38 gun systems. Presumably in the counter UAS role they are using the “AHEAD” anti-missile rounds, rounds that might have been designed specifically to take out UAS, that fire 152, 3.3 gram tungsten metal sub-projectiles. The guns have a very high muzzle velocity (3,400 ft/sec for the AHEAD round) and a much higher rate of fire (550 rounds per minute per gun).

With the AHEAD round, the projectile weight is 1.65 lbs. (0.750 kg) compared with 0.406 lbs. (0.184 kg) for the 25mm HEI and HEI-T rounds, and 0.79 lbs. (0.362 kg) 30mm HEI-T round so the potential radius of destruction is substantially greater.

Still the 30mm with airburst ammunition should be effective, but it will probably require more rounds to get the job done and will have shorter effective range. Unless the 25mm has an airburst round it is unlikely to be effective.

It might be worth considering that while the Gepard’s firecontrol is radar, the Mk38 firecontrol is electrooptic. I can’t say unequivocally that that is a disadvantage, but it might be. Surely the drone builders will attempt to include countermeasures against both types of firecontrol.