I called Alliant Powder and with a 95 gr RN lead cast bullet, they recommend 2.0 to 2.5 grains of Red Dot (I know it's not the powder you use, but it's still a good data point). I'll be testing that either this monday if the range is open or next weekend for the first time as I just got a 380 a few days ago. I'll even chrono the results and share if anyone is interested.
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