FiveFrameSwing
Banned
I'm no instructor, but I see a lot more movement from other parts of the body besides the hands. So I would focus more on that, than just turning the barrel with the hands. For example, lower body, elbow to slot position, core.. etc. hands look pretty quiet to me in this gif.
The hands sense the barrel being arc'd ... many folks confuse this with the hands actually arcing the barrel.