I got it from some guy who was outside the strip, I don't remember his name, I have to do a bunch of conversational skill requirements, like guns and survival.
The .44 Semi-wadcutters take the same materials as the regular .44 mag but a little bit more lead and powder. So, you can break down the .44 mag rounds and make the SWC rounds. If you don't see them at the reloading bench you might not have a high enough repair skill.