I shot a couple of S&W M52s in .38 Special Wadcutter.
Working for accuracy, the important considerations turned out to be:
1) diameter of the bullet. The Rem L-HBWC was the best with its 0.360" diameter (provided the case was expanded enough not to swage the bullet diameter down)
2) powder and powder charge
3) Seating stem that matched the bullet better than just a flat seating stem
4) The use of a Redding Profile Crimp die
5) NOT sizing the cases. For a revolver, you will have to size to fit the cylinder. The light loads I fire, however, just expand the case enough that the Profile Crimp die reduces the case diameter enough that just the last 1/2" of the case is still large enough that the rounds are a tight fit. However, the slide always shoves the rounds in and the gun chambers just fine.
In all my testing, case weight, case head stamp, and case length had NO statistical effect on group size. I fired many sets of rounds with one set consisting only of R.P. or Win brass and the other consisting purposely of ever weird head stamp I could find. More than 50% of the time, the mixed cases shot smaller groups.
I decided that the thin walls of the R.P. case, in this particular case, were a plus. For match loads, I only use R.P. cases. For general practice and plinking, I still use mixed brass.