Sir Charles,
I believe I may have even recommended using .41 Mag cases.
This was what I used to work up loads for my .44 S&W American.
They worked very well. But, the S&W extraction star works on about 1/3 of the cartridge case rim diameter. Whereas, on the MH, there is a very small amount of the rim that comes in contact the extraction ring.
When I checked my .44 Americans in the MH revolver, they fit very well. I, however, did not think about trying the extraction system. I only checked for chamber fit.
I still have not shot the MH, but because of this very long thread, I have gone back to check on how well they extract in the MH. Not good! Extraction was none, but being un fired, the rounds just fell out.
Starting with .44 Special maybe a better bet. And there are companies out there that will make alterations to common cases. If, they have the measurements of the case you need?
My best,
Blair