If you go to the Hodgdon on-line Reloading Data Center and compare recommended loads for the two powder, you will find exactly the same data for both powders.
These aren't the only 2 powders that are identical.
Winchester 296 = Hodgdon H110
Winchester 231 = Hodgdon HP-38
Winchester 571 = Hodgdon HS-7
Winchester 540 = Hodgdon HS-6
I think there are others, but these are the ones I have on hand.
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