Ability Type: 
🛡️ Passive Ability
Effects: 

Through careful measurement and efficient packing, you use half the black powder normally required to fire your gun (rounded up). For example, a War Musket requiring 3 uses of black powder needs only 2. This does not reduce the extra black powder used by Overcharge skills. Requires the Powder Measure tool. 

Requirements: 

Gunsmith's Eye