for this machine combination, use this grind setting
probably not as simple as that as will vary by coffee bean/roast also
Correct, density of green beans vary with many factors. Then darker roasts will be less dense than lighter for a give bean.
As for the Hario for espresso? It's just not designed to go that fine, it may work but you'd almost certainly shorten the life of the grinder.
@Matisse started
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probably not as simple as that as will vary by coffee bean/roast also