My 340SC .357 does chamber my Cor-Bon 125gr JHP factory ammo.
I might see if a 5 round moon clip will take the .38 supers and work. I doubt it be who knows. Might make the rim to thick and the cylinder not close.
I suspect different manufactures of .38 Supers use different external specs just as chambers vary to.
"The government has confiscated all of our rights and is selling them back to us in the form of permits."