I don't use Tung oil on mine, but I do like Tru-Oil. I redid the finish on my Bubinga grips on my 649, adding four coats of Tru-oil, using 0000 steel wool in between each coat and five coats on my Cordia ahrends grips on my Model 27. They are glossy, but not so much so that you can't old to them and the draw is just fine.
Here is the 27 before Tru-Oil
and after....
