If your hand is large, you might try Herrett's Jordan Trooper grips in smooth wood. A friend had those on his M-29 and they reduced recoil effects tremendously, while allowing greater control.
If the grips are checkered, you may see the imprint of that checkering in your hand for awhile after a shooting session.
A .44 Magnum is not meant as a target gun. It is meant to hunt suitable game or to save your life if attacked by a large animal. If you fired 18 rounds without getting a bad flinch, you're good to go!