Are you reloading any other calibers? I use 231, and am very happy with it. I chose it because it also works for .38 spl.
I didnt want to keep switching powders, (one less thing to screw up).
Incedently, after extensive testing, 4.6 gr. for 200 gr. lswc, was the most accurate and cycles great through my M&P.
(3.4 gr for .38 )
Good luck
Collin