Sorry to be late here. I have not had experience with those powders, but the Sierra Manual lists for 165 grain bullets: IMR 4064, 41.3 gr (2300 fps) and 43.3 gr (Max for 2400 fps). For H380, 44.8 gr is max and gives 2300 fps. The manual states that the IMR 4064 at 2300 probably gives best accuracy.
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