I shoot a lot of light 38 cases in my 686 when I go to the range
just for a easy outing.
I also test 38 special first time loads for fps and pressure etc.
before I shoot them in my M49 J frame, if the loads are near maximum.
Over the years you "Learn" what a J frame +P loading will be
out of a 6" barrel, within 30 fps.

38 special in 110 and 125gr jackets are ok in my 686 but I get
my best accuracy with the old stand by 158gr lead bullets.
Both a 158 Lwc at 755fps and a LRN at 972fps will have 5 bullets touching at
15 yards off a rest, that I developed with Red Dot and 2400 powder.

I don't mind cleaning a 357 chamber after shooting 38 specials.
I treat my weapons as "Shooters" but I also take pride in keeping them very clean.