Hey O'l Lonely One
I have not used the Mav Dutchman 200 in 44-40. I eon't even own a 44-40. I have however, loaded a pile of them in both 44 Special and 44 Russian cases. My results were pretty stellar. Grouped really well out to 100 yards. You do wind up with more lube than you really need with smokeless but what the hey, a little extra lube never hurt anything.
Now I shoot with APP. Don't need lube. But the Dutchman shoots just fine Nude with APP. Load data used was same same as load data for other cast 200Gr bullets, although I mostly shot reduced charges for CAS.