To make it clear, SD and ES are attributes of ammo consistency and indicate a good loading technique/components with less variables.
Its not always directly translate to the ammo/barrel downrange accuracy. Very consistent ammo in the particular barrel loaded to the wrong average velocity, may make a larger group than slightly less consistent ammo, but with velocity optimized for given barrel.
Correctly optimized for your barrel velocity AND a consistent ammo with low SD and ES = ultimate goal.