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The smallest I would go is #10.
10/3 will give you two 20A circuits. This would be a shared neutral circuit with two hots. If you have 120v loads running on both circuit this will actually lessen voltage drop.
Voltage drop is a convenience and design thing. Not a code requirement.
Without a known load you cannot know what the VD is going to be. With no load there is no VD.
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