It's been a couple of years for me but I used a 3" M66 and 4" 686 with Comp3 loaders and Speer Lawman 158gr +P FMJ ammunition. I enjoyed the M66 more but shot a little better with the 686. Made Expert with the M66.
Now am using a 6" M19 in ICORE and PPC, still got the M66 though.