Agreed. I'd stick with 158 gr. There is some disagreement about how bad the flame-cutting was with 125gr. but it's not worth the risk.
Look up 38/44 loads.
Here's one link (although the pics don't show up because ot Photobucket's changed policies) Doubt you'll get any data for True Blue, although you never know. I'd stick with 2400 as I believe that may be the powder this load was originally developed with. And remember you will get some powder residue buildup in the cylinder due to the shorter .38 case, so be sure to give the chambers a good scrub when you get home from the range.
A couple more links: .
357-level loads in .38 Spec. cases, and
The 38-44 Outdoorsman.