While charging, the range indicator steadily grows, then stops at a certain point. However, varus can continue to channel before the skill gets refunded. During the time in between, does the Q still gain more damage? In other words: does the skill continually gain damage and range until just before it gets cancelled? Thanks.

No.

i dont think so, the cast bar stop growing, so IMO the damage stop growing...

But i would like to get a red answer too!

the damage increase stops when the range stops

Meddler, are you aware of the current glitch with his Q where it'll cancel randomly if it hits a bush? It's very aggravating.

If so can you give us any info on a ETA of a fix.

Yeah when the bow opens the damage is at its peak.