I understand what you want to do with the .44mag to .44special velocities.
I load and carry my own ammo, despite what is normally said about carrying handloads.
I have never had any misfires with ammo I have loaded. I can't say that about factory ammo.
Beside with the argument of factory vs homemade, I load DOWN from .44 mag, So I can always say I wasn't loading a Hot Shot Cop Killer Ammo.
The .44mag is my favorite round, but it is overkill when used for two legged defense.
I have an assortment of different brass, including some nickle brass.
My load is 200gr Hornady XTP JHP, on top of 9.2gr of Unique, in my Ruger Alaskan.
I don't have a chrono, but by doing the math, my estimates are I'm getting from 950 fps to 1000 fps, which produces muzzle energy of about 500 ft lbs to 575 ft lbs. That's about the same muzzle energy of a 45acp + P.
I use the nickle brass for my downlaoded .44mag, that way at a glance I can tell what is what. If you use separate brass, you can use a red, or any color sharpie to color the rim so you can tell the difference.