Contrary to popular belief, the sum of man's knowledge is not always available free for the asking using a google search!
The .38-44 cartridge was in its heyday about 90 years ago.
It is a fantastic cartridge.
If you want to learn more about it, you'll need to track down period-correct sources.
A good place to start is with Phil Sharpe. He did more than anybody with the .38-44 cartridge, and indeed his work led directly to the .357 Magnum.
Attached is an excerpt from his book. Look carefully and you'll see some of his laboratory pressure tested loads.
For further research, look up the origins of the Lyman-Ideal #358156 mold. It has two crimp grooves specifically for the purpose of being able to use the bullet in either a S&W .38-44 or a S&W .357 Magnum (N frame, to be specific).
PS: Use the search tool on this forum to learn more. Lots of folks have posted stuff here. I've submitted quite a bit, but won't be typing it again.
