I think you've got your answer. The 6.5 Creedmoor based on how you will already have him "good to go out the door" with the ammo on hand. Add to that, when ammo does come back in stock, that will be one that will be most available. He doesn't really appear to have any holes in the spectrum of "needs"; so, your idea of that 6.5 is a good one.

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