Activating Vampiric Burst after the duration of the effect while bullets from another activation of Vampiric Burst are still in the magazine still increases the amount of ammo. This can be abused before entering combat to get enormous magazines forgoing the need to reload.
Yeah but it has 30 seconds cooldown. i wonder how much time you are gonna be able to use only skills and melee, without firing your gun to get to the "enormous" magazines