In my opinion, when loading heavy for caliber bullets in magnum and big bore handguns there is only one powder H-110 (though it is also sold as W-296). You can't download the powder, but for top accuracy and velocity I have yet to find a better powder. For the 44 use a CCI 350 and see what is most accurate in your revolver between 21 and 22.5 gr. I know, slightly over book max but find out what your gun prefers. H-110 likes a heavy bullet, good tension, a strong crimp, hot primer and a near full case of powder.
