Castaway, those loads are among the worst to cause hitting high....a large charge of slow-burning powder with the heaviest recoil. By using a faster powder the recoil is reduced substantially yet velocity and barrel time can remain about the same. Thus the bullet lands lower on the target. Reducing the charge of your current powder won't do it. If you don't want to experiment with different powders etc. then do what jpsmith1 suggests, that will make your revolver more versatile.
If interested, in Lyman #48 - 4" .44 Magnum with 300SP:
13.5 grains BlueDot = 923 fps @ 36,800 cup
20.8 grains H4227 = 985 fps @ 38,600 cup
No animal or target would see any difference downrange between the two loads, but the BlueDot load has notably less recoil.
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