I have cut down .38 special cases to make 38 S&W. But, I don't use smokeless powder. I use a .358 lead bullet. I use FFFG black powder. You can't really overcharge it. There simply isn't enough room in the case.
I have a S&W model 1 that I use this for.
Romans 1:16 I am not ashamed of the gospel, because it is the power of God for the salvation of everyone who believes: first for the Jew, then for the Gentile.