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What hypothetical range could we come up with?
Use pokerstove, slide the range bar to x percent and it will show what hands are in that range. Actual ranges in practice aren't really in this order, but this will give you a rough idea of what the top 30% of hands looks like.
There are other hand ranking charts that will help you, ones that aren't based on showdown value alone. General opening ranges doesn't have to be perfectly precise, they vary player to player somewhat anyway.
Helpful hint, try to pay attention to the range of hands that he 3-bets versus calls a raise with if he's ABC. This won't work at higher games, but lower some players act like they have a cheat sheet for how to play certain hands.