If attempting to tap fire the Traveler's Chosen with the catalyst applied, it will use two bullets per click (with rare exceptions). I tested to make sure my mouse was not double clicking with an online test, and it was not. I additionally tested with another mouse, and the same ammo usage was observed.
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This is a common issue with 300rpm sidearms that have full-auto trigger, makes TC with catalyst and rat king unusable in pvp for me, something I hope can eventually get fixed before the full auto feature