From the HSM website:
http://www.thehuntingshack.com/catalog/retail/Load Data Plated and Cast bullets.pdf
Plated Bullets:
Jackets on plated bullets are applied using an
electroplating process and therefore are not
as thick or sturdy as on jacketed bullets.
These bullets fall between regular cast and
jacketed bullets for load data. We recommend
using lead bullet load data choosing the
same weight and similar design.
You should not exceed 1250 fps using our plated bullets.
45 caliber bullets should be loaded to no
more than 850-900 fps for best results.
We recommend a slight taper crimp using the Lee Factory Crimp die. As the jacket is not
as thick as a regular jacket, take care to
not over crimp as it will deform the bullet and
degrade accuracy.
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I see Hodgdon has data for a 158gr LSWC with Universal for 38 special. Also, I see the data for the 158 Hornady XTP is nearly the same.
http://data.hodgdon.com/cartridge_load.asp
Hope this is what you were looking for.