You will have to try a ton of them at stores. The 686 lost steam for about ten+ years and the molded holsters were not patterned for wheel guns like the 686. Now they are making molded holsters for other guns but it maybe awhile for heavy guns like a 6 incher.
I carry aa trooper and a four 586 in a shoulder holster and the colt in a flapper when it is on my hip while hunting. For ccw, with the four, i use a pancake that rides high, it is a bianci that had to be modified to fit.
The Tandy leather Factory has kydex kits that you can make what ever you want. I talked to them at a big game show. It even has instruction on how to do it and it don't seem to be all that bad. They are located near Richmond Va. Ph.# 804-750-9970 E-mail-- Richmond138@tandyleather.com The manager's name is James Daily