What size drill to use for undersized Cuetec 3/8-14 tap

I have a CF blank that I'm finishing to fit a Cuetec 3/8-14 pin. I bought an undersized 3/8-14 tap. I installed a phenolic insert and am looking for confirmation of what size to drill/bore out

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What size drill to use for undersized Cuetec 3/8-14 tap?

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