Before anyone starts Taurus bashing, here are some things I always consider when someone has accuracy problems with a .44 Magnum.
1. How much handgun shooting experience have you had?
2. Are your loads factory or reloads? If the latter, who loaded them? How much reloading experience has the reloader had?
3. How do you use your sandbag rest? You should rest your wrists on the bags, without letting the gun touch the bags or the bench.
4. What kind of ear/eye protection are you using? How much are you affected by the blast and noise?
Some folks start off in shooting with a large, powerful gun, react to the blast and recoil by developing a bad flinch, then claim the gun is inaccurate. I suggest you let someone else, perhaps a more experienced shooter, try the gun and see what results he gets.
Jim