Eagle Grips makes nice looking classic wood grips for the Redhawk but I’ve never handled them.
https://www.eaglegrips.com/classic-grips/288-ruger-redhawk-square-butt-genuine-rosewood-classic-grips-checkered.html#/select_option-regular
I enjoy shooting mine, with a single exception: trigger return is downright crunchy.
A Wilson spring kit lightened the pulls but something inside needs to be smoothed out, and I can’t find it. So until I can get it to a smith, it sits in my safe.
I have a 40-year-old Service Six and two GP100s, a 6” blue and a 5” Lipsey’s special. The Six’s trigger is much smoother than either GP, even with the action job on the 6”.
And it’s not because it’s been shot so much more; since it has family value it hasn’t been shot much at all in the last...
El Paso Saddlery offers several options as well. I have their Tom Threepersons Crossdraw for my 6” GP100, and their Tanker shoulder/chest rig for my 5.5” Redhawk.