WarframeAlchemyLab ES
Ammo Case

Farming plan

Ammo Case

Arsenal: Ammo Case
Dropped by
Corrupted Butcher Common 1.14 %
Corrupted Lancer Common 1.14 %
Chance of getting it by number of runs
0% 25% 50% 75% 100% 16 32 48 64 80 61 runs · 50% 61 runs · 50%

Each run has a 1.14% chance. The curve is 1−(1−p)ⁿ: there is never a guarantee, only growing confidence.