Ostwind 2 and corelian should get a few hvap rounds for self defense. 49 mm pen can’t even pen sides of most medium tanks. Result is that you stand in spawn and can’t really defend other tanks from planes well.
Ammunition should still be limited because main task is still shooting down planes. I think 32 rounds (2 belts) should be enough. 16 would be an option aswell
This ammo is already in war thunder for the ju87 g1
I would write a suggestion if community approval is good.
if youd compare the ostwind’s with other AAs at around its BR then they should stay at the BR even if they get a Full HVAP belt. M19/42 get a full 72mm AP belt. russia has one at 3.7 with a full 70mm belt. Italy has a full 90mm AP belt, France a 3/4 shots 90mm belt and sweden a 2/4 shot 90mm Belt. all of that is around the same BR as the Ostwind and Ostwind II. my guess is that they put the Ostwind II at such a high BR because its the only AA around that BR that shoots APHE.