Sorry if I wasn't clear, but I said I would only consider reraising to 250 on the first hand, and even then I would only do it depending on my read of the raiser. It wouldn't take you down to 460 chips, it would take you down to 670 or something, and the blinds are still 25/50, so you're not crippled.

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I can't see how reraising 1/3 of my chips only to fold to an over card on the flop is the best play

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If you feel like you would likely fold to any overcard on the flop, then I agree, reraising is not the way to go here.

And yeah, on the second hand, if you were going to reraise, then reraising any amount less than all-in would be a mistake.