Amateur tip: If the dot covers the target and you can't see it, the dot is too bright.
I like to use the irons for those ranges though.
I'm aware of that tip. However another one I read was zero (at 200 yards in my case) with the top of the dot, at a given brightness.
When I despair, I remember that all through history the ways of truth and love have always won. There have been tyrants, and murderers, and for a time they can seem invincible, but in the end they always fall. Think of it--always.