I got a 686 cut for moons by Bob Miles and it works great with moons or not. He doesnt cut the cylinder all the way flush so you dont have to use moons if you dont want too.
The last year I have been shooting USPSA with my 610 6.5" and having a blast. I won a slot to nationals with it and hope to make a good showing there. The only thing ive done to my 610 is have the cylinder chamfered pretty aggesively.
Ive been using WWB 165gr in Ranch moon clips with good result. The gun shoots better than me. I have been using the Bianchi cup 002 holster i bought like 12yrs ago for my 686. I did take the heat gun to it to open it up a little, but i may take the dremel tool to it soon just to speed it up a bit. Good luck.