Hi Sara,
not to burst your bubble, but not only are HP38 and Winchester 231 ballistic twins, they are actually the same exact powder, poured into different canisters. Yea, I called Hodgdon to double check. Same as H110 and Win 296, and probably a couple more. My guess is that maybe the difference you saw in accuracy was due to different lots, or maybe just how you were shooting one day vs another.

But I'm glad to hear someone else using those powders in 44! They worked well for me, and burned pretty clean.

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WARNING: The lead contained in this bullet has been known to the State of California to cause severe injury and even death... especially when travelling at over 1,400 feet per second!
Surgeo