I'd like to elaborate on my comment in post #13, re plated wadcutters.
Wadcutters, being what they are, have a tremendous amount of bearing surface for their weight. Also, lacking an aerodynamic nose profile, they have a very low ballistic co-efficient. Taken together, a wadcutter requires a rather narrow, and low, velocity range to stabilize properly for acceptable accuracy. Generally, that accuracy range for a 38 cal 148 gr wadcutter is about 740-870 fps.
At this velocity range, a jacket or plating is not only unnecessary, it's potentially dangerous. The large bearing surface greatly increases bore friction, increasing the possibility of a stuck bullet in the barrel. In a revolver, it's all too easy to miss this. Pressure is low, so in the event of a squib, excess gas just vents off in the barrel/cylinder gap. Recoil is low, so it's hard to feel the difference. And, due to the manual operation of a revolver, a malfunction generally doesn't occur, unless the squib is stuck in the forcing cone.
I think most people who cast, and even many who don't have slugged the barrel of a gun. Pretty easy to do with a soft lead slug. Try it with a plated bullet (or, better yet, don't) and you'll get an idea how much resistance the plating adds!
If you want the shooting qualities of a wadcutter, I suggest sticking with a lubed, soft lead bullet.
If you prefer a plated bullet, choose the appropriate velocity range, (say over 900-1000 fps as the lower limit?) and go with the appropriate bullet design like a SWC or roundnose.
Hope this helps save someone some hassles or trouble.
Thanks,
Jim