+1..Ruger should have produced a GP100 44 mag instead of a 44 spl
S&W should also kick out a 2.5" or 3" M69 also.
More good advice. And I'd add, in spite of love for my "L" frame Smith M69, if you REALLY ARE going to be firing lots of full house .44 Magnum loads, you owe your wrists, elbows, and ears, a good heavy revolver and superb hearing protection. BTW, I wear BOTH plugs and muffs.Go try a few on for size. Probably no other cartridge requires as good a fit or has as many different sized revolvers.
It sounds like you need a 4.2" Redhawk , but I would hold one first it has a very fat grip .