My standard load in .38 spl for decades has been a 158 gr cast SWC with 4.0gr W231 and that's what I mostly shoot, though lately I've been shooting more 125 cast LRN with 4.0 gr of 700X. The bullets are a bit cheaper and I'm trying to use up some of the 700X I bought during the Great Powder Shortage. With the 125 gr LRN it turned out to be very accurate.

I load some powder puff .41 Magnum loads with Trail Boss and a 215 gr cast SWC. Super fun, super accurate.