After a few hours of reading innumerable posts and paging back and forth between books and manufacturer's online load data, I think I have a reasonable approximation.
The FBI load appears to be just a regular .38 special +P loading with a 158 Gr semi wad cutter.
The Treasury load dictates 1020 fps out of a 2" barrel. It looks like you could get there outside of published data
My 6" GP100 would probably take it like a champ, but I'm just going to file this one away in my notes and not go there. My .357 magnum hand loads seem stout enough, no sense in trying to make a .38 load what it is not.
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