Yup, the .44 Special is the basis for the .44 Magnum; only difference is a bit of case length, sixteen on an inch IIRC. I’m sure Winmag will know.
You may want to consider just reloading the .44Mag. You can make any power load you want. Lead or Jacketed etc.
Doesn’t have to be a full bore G’nad type reloading set up. Dillion makes a heck of a reloader though. You can do your .45, .40 and 9mm with only a change of dies.
A LeeLoader will do the job, one round at a time. I have loaded lots of ammo that way.
We’re going to start reloading real soon now. Price of ammo is just too much. Until we finish the other half of the basement though, it will be tough to have a good place for it. We’ll manage.
With the price of ammo what it is we are planning to get set up for reloading soon. Since we would want to do 45acp, 9mm, and .223 just for starters then I am leaning toward a going right for the full progressive loader. But I am not sure yet.