When I was shooting .357 a lot, I ran cast in .38SPC cases... once. After I got that mess cleaned out, I just loaded .357 cases exclusively. Unique is a reasonable powder to load lower velocity loads in bigger cases because it isn't position sensitive, but it may not burn very clean.
If you are getting your bullets from Montana, I would probably start with .358" bullets and see what that gets you, you may have to move to .359" if you get significant barrel leading.
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"I have this pistol pointed at your heart!"
"That is my least vulnerable spot."
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