It's been years but I had Ahlman's in Minnesota do several doubles and their work was really nice as to finish and no warping. Colors were great and I even found a few small little pieces of charcoal still stuck in nooks and crannies that had adhered through the cleanup. I found the company 35 years ago because I phoned the old Herter's catalog number for their stock department. They answered "Ahlman's". Turns out they did all the stockwork and gunsmithing advertised by Herter's which was not far away.
I had several Ruger No. 1's and Falling Block Works highwalls done by Case Color of Ohio and they did excellent work. All new guns that I stripped and disassembled.