I used to shoot a whole, big bunch of .38 Specials using the Speer 158 swaged SWCs, with 4.0 231. It was a mild mannered load that shot like it was guided by radar, in several revolvers, a Smith M28, a Smith 36, and Security Sixes. They were pretty mild loads. Whenever it suited me, I'd bump the powder charge up to 5.0 231, but used it in .357 cases. Then I didn't have to brush the cylinders as often. I never chrono-ed that load, but it had to be pretty mild.
