I've found any of Xtreme's plated 158gr bullets, either SWC, TNFP, or RNFP, accurate with the right load. I've decided on the RNFP for my 357s.
I've found 6.1gr/HP-38 (same as W231) to be an accurate load with this bullet, in 357Mag cases. Reduce by 10% for the smaller 38 Spcl. cases.
I've found the following also very accurate with them, in 357 cases, in my 5" 686+ and 5" 327TRR8:
Unique @ 7.0gr, ~965mv
CFE-P @ 6.3gr, ~1050mv
P-P @ 8.0gr, ~1000mv
G-D @ 5.7gr, ~975mv