With a new shooter, close is good enough. If you know how, you would be giving them a much better lesson with teaching them how to use their eyes, setting up with a good hold point, blending in with the target speed, rather than fretting over exact fit.
Those boys in the video are shooting with their eyes. 👀
The hands follow the eyes, once you have learned to use and trust them.
Last edited by battue; 12/27/19.