canoeguy,
I know I use W231/HP-38 for a lot of calibers but I'm telling you, it really does work well in the .38 S&W.
I would start with 2.2gr W231 under that 158gr bullet which should get you ~600 fps from a 4" barrel. I usually charge 2.5gr under a 160gr RNFP bullet.
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SWCA #3437
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