So, with the Bounty Hunter, his second level 30 talent, Double-Shotted, has a conditional cooldown reduction. “Scoring a headshot with this attack reduces the cooldown of Locked and Loaded by 40%.”
However, instead of filling 40% of the skill bar after firing, it brings it to something like 90%. About 14 seconds. I suspect the reason for this is that it “adds” the 40% while the bar is in the process of depleting (you may notice it’s not instantaneously drained, it takes a half-second), and this cancels the depletion.