I have loaded 125, 140 and 158gr plated for .38spl. My S&W M-10 has a 6" barrel and my S&W M-36 a 1.875" both are fixed sights and are regulated for 158gr bullets, the 125gr bullets shot 3-4" low at 10-25 yrds, the 140s about 2" low, the 158s shot POA.
At first I used a light roll crimp on the non-cannalured bullets this worked well when using faster powders like Bullseye and W231, slower powders did not burn completely with the light roll crimp. Then I found a taper crimp die at a gun show for $5 and use that now, it works well for 140, 158gr plated with AA#5, I still like W-231 for 125s but rarely load them.