Tank used: Progetto 65
Use a tank that you usually know that you do alot of dmg with. The key to this mission is to stay alive as long as possible and just let your gun sing. I think its easier to do this in a T10 tank just because if you get bottom tier, if you try other tiers, then you will most likely struggle to get the highest dmg. I would also turn off Grandbattles for this one, I think thoose are great for mission normaly but not in this case.
Best of luck to you all