Weapon ranges in MFZ are exclusive to one another and not “downwards-compatible.”
This means that direct-fire cannot be used at hand-to-hand range, just as artillery cannot be used at either hand-tohand or direct-fire range. Each weapon system only works within its increment.
If you are unsure about the ranges between things, you can measure at any time during the game, even out of turn.
When you measure, measure from the closest points between target and attacker. When in doubt, the target is in range.