.357 125gr XTP 10.6GR Accurate #5. In L Frame
.38 Spl 158gr LSWC or LRN 4.5gr W 231
125gr Magnum loads have been known to cause forcing cone cracks in K frame S&W revolvers so a 158gr Magnum loading might be wiser. In that case I would choose a 2400 loading with that bullet weight. A#9 , H110 or 4227 also work well.
Jim