In my own testing of W231 (HP-38) in a Smith 629 .44 mag, I've found the same thing that you did. Upping the powder charge produced much better accuracy, as well as more power. You can easily go up to 10.0 grains of 231 with a 250 gr SWC or FP. Why not try 7.5, 8.0 and 8.5 grains as well?
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