Ditto, 231 works very well with the 148 grain Wadcutter and is very clean compared to Bullseye. I used Bullseye for many years as I was a cheapskate and it was the least expensive. After trying 231 once I quit.I have loaded all bullets in .38 Special with W231 ever since the CH representative told me that it was what they used to test the measures on their Autochamp progressive loaders.
The bushing that came with the Autochamp throws 3.2 grains of W231, so that is what my wadcutters get. I bought or got a friend with a lathe to make bushings for heavier loads for semiwadcutters. I now load on a Dillon, but still with the same powder charges.