Shooting my Blackhawk convertible over a rest, I could not determine any consistent difference in accuracy between .357,.38 and 9MM at 25 yards. But, I was not using cast bullets. FWIW, back in the Dark Ages I loaded all manner of cast bullets for my 9MMs. I tried different weights, diameters, profiles,etc., but never achieved accuracy with cast bullets equal to that achieved with jacketed bullets. Others have reported very good accuracy with this or that cast bullet 9MM load, but it was not to be for me. I no longer have the 357/9MM Blackhawk, but do have a couple other 9MM revolvers. I still don't use cast bullets in any of my 9MM firearms...
BTW, Some especially energetic factory 9MM seemed to produce recoil in the heavy Blackhawk revolver closer to .357 than to any factory 38 +P I used. Chronographing some of the 9MM ammo showed why that would be
My Uberti has 2 cylinders a 45 Colt & 45 ACP, but they both use the same diameter bullet = "452.5"
Hense the same accurracy with either cylinder
Where as a .357 is actually ".358" & a 9mm is ".355"
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