Send the barrel to SSK and have them mount a T'SOB and use 3 rings. It's the cheapest most dependable way.
I recommend a 2X Leupold, although a 4X will also be satisfactory. No more magnification than 4X is necessary, or even desireable, on a .44 Magnum in my view.
Although Steve P. recommends a 2.5-8X Leupold, they're far too heavy on a 10" .44 Mag. in my opinion.