Cal, HP-38 is made by Hodgdon powder,who also bought out the rights and now makes all of Winchesters' powders. While HP-38 is almost a flake like Unique, it is exactly the same make-up and formulation as WW231. Both the Burn-rate and the pressure-curve is identical. HP-38 will work in any cartridge you use 231 in with the exact same results.
Difference? Since it doesn't carry the Winchester Moniker, it sells for around $5.00 a lb. cheaper than WW231.
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