Wirbelwind max range = 1700 yards
Ostwind max range = 2700 yards
If this is truly the maximum range for damage to occur, then it needs to change to the guns actual ability.
In the case of the Wirbelwind the gun is capable of 2,200m effective (sounds like 2,200 damage to me). And the Ostwind might be effective against air targets at
only 4,800 meters, but the gun can hit ground targets at up to 6,500 meters.
Of course, if these changes are made there will be substantial whining.