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I have a Star Super B [same thing as Super A, but in 9x19mm Luger].
I have reamed out the chamber to 9x23mm.
I have reamed out the slide to take a bigger recoil spring, from .431" to .4375".
Spring; Wolff gunsmith pak #14 spring #10 .045" wire 24 coils 4.75" extended
I put a new rear sight on it , Brownells 625-100-311.
I opened magazine lips to allow cartridge rim release .13" sooner.
Max Hodgdon published load for 357 mag is 8.3 gr LONGSHOT 158 gr 1.58" 42 kcup
I have been shooting my Star Super B with 10 gr LONGSHOT 158 gr 1.29"
The recoil is horrendous.
I have found Starline Super Comp brass to hold more powder but not hold as much pressure as Win 9x23 brass.

base: Largo .375", 38 super: .384", 9x23: .390"
case: Largo: .91", 38 Super: .9", 9x23mm: .9"
neck: Largo: .375", 38 Super: .384", 9x23mm: .380"
OAL: Largo: 1.32", 38 Super: 1.28", 9x23mm: 1.245"

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