Regardless of the cartridge, I've always found H110 / 296 to be the equal of #2400 in terms of accuracy even if #2400 may lag behind slightly with regard to velocity. #2400 is also somewhat more versatile than H110 / 296. The big disadvantage to the latter is the significant muzzle blast and flash in comparison with #2400.
You might purchase at least a Lyman manual if you don't already have one. It may not have .44 Special data using H110 / 296, but is should have plenty of .44 Special and Magnum loads using other powders. There should be other reputable sources with H110 / 296 data. Use up your pound of H110 because it will work, but consider other powders that may be more useful.
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