There are some old loads floating around for using 2400 in 38spl. Here is a link,
http://www.castpics.net/LoadData/default.html it will provide you with older reloading manuals that publish some of those loads. Remember with any old load data work up with caution, I recommend starting at no more than 80%. Also if you can't find loads for 125gr jacketed look for jacketed loads in heavier bullet weights.
Expect one dirty revolver too.