MD Grips
https://mdgrips.com/welcome-1
Have dealt with Mike several times. He fitted two of my rugged 480's with Elk Antler grips. Perfect work.

Badger Grips is a good option too.
https://badgercustomgrips.com
Jim Badger fitted my Ruger Hunter when no one else could. He has passed. But, the guys that purchased his business are good to help.