My 686 (see bragging board Photo) has 4 inch also - shoots 180 hard cast really well. I never got jacketed to shoot that well especially 158 grainers. I sold my razor and got a Matchdot II - just fits me better. Great groups from yours. Care to share some load data? I plan to take a WT with mine this year.
First Handgun Deer: ~1982 8" S&W .38Spl
SW 686 4" with Matchdot II
SBHH 44Mag & .45LC 7.5"
T/C Contender G2 12" .35-30/30 (Bellm)