I took it he wanted a stiff load, that is why I gave, what should not be a full load, but quite stiff. He can load light with any number of fast burning powders. But, Like Ben suggested, there is inherent danger in using fast powder in the 44 mag, unless you use the bulky stuff, which I never have used.
Not only is there the danger of a double charge, but a bit too much fast powder can really raise the pressure. However, I found W231, a fast powder, very accurate at a large range of loads, as long as they are below about 10, or eleven grains. A top pressure load is still far short of the velocity a 44 mag is capable of.
That is why I like the two classics, 2400 and H110/W296. In spite of what Winchester says about their 296, I have loaded H110 down from max loads of 24 or 25 grains, with about a 250 grain cast bullet. I found it still accurate at 20 grains, and a much reduced recoil.
22 of 2400 is full up. I found it still accurate down to about 18 grains. Much below that and it left unburned powder, so was obviously not efficient or accurte.