This is a route/method I used to resupply ammo efficiently for the Laserkraftwerk and achieve weapon mastery level 10.
- using an Ammo Booster helps
- applying at least 3 Tempo weapon attachments increases Max Ammo by 25%
Ammo Resupply location 1 = 0:32
- replay General Winkler mission
- return to Catacombs when ammo is empty