Not a problem!
I and my family have shot many cast bullet 38 loads from my Ruger Security 6 - 4" over the years, and if/when the cylinder no longer allows the insertion of 357 loads, just take the revolver apart and set the cylinder in a container of Hoppies or?
? and let it soak over night.
Then the build up will come clean with just a bronse brush and patches.
Maybe I have done this a half dozen times in the 30+ years I have owned the gun, and by the time this is needed it will be time for a good cleaning anyway.
Easy cure and no big thing.
Keep em coming!
CDOC