H-110/Win 296 and Alliant's relatively new 300-MP(Magnum Pistol) and perhaps Lil Gun are considered the best powders for a heavy weight bullet in the .44 Magnum, by most people. After that then 2400. All other pistol powders that burn faster than 2400, are continually less ideal, the faster burning they are.
Also the slower burning powders fill the case better, giving more consistent ignition, with less pressure. Its also impossible to double charge a case with the slow powders, because they will over flow. You could easily put a double charge of some of the fast burning powders in a case and not notice.
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