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H110. Good luck finding any though.
I'm also using SR-4759 which has been discontinued so, again, good luck.
I'm told 2400 is also excellent but since it's an Alliant powder, good luck.
For light to moderate loads I have been using Tite Group since that's what I've been able to find. Saving my last ~1/3lbs of H110 for my full house loads. Been shooting most powder coated bullets through my 44mag with intermediate special-magnum loads.
H110 and Winchester 296 are excellent but tough to find. IMR 4227 is slightly milder but I can get it at Cabelas quite often. It works fine for 357 mag,44 mag and 500 S&W. Unless you like the punishment, you are best to load your 44 mag below max. For a 240g FCPRN like those from Budget Shooter, try about 23.0 g of 4227 with a 1.600" OAL. Should be about 1300ft/sec
Red Dot for target/plinking loads & 2400 powder for hunting loads.
Sure hope more can be found in the next couple of years,....retirement means more time to shoot....