For a new reloader, I'd suggest starting with a published load with powder, bullet, and primer as listed. If you have some Unique I would recommend that over W231 for a .357 Mag. Jacketed or lead bullets with a cannalure or crimp groove will suit you best (your dies prolly have a roll crimp die), and plated bullets need a taper crimp and need to be held to below 1200 fps. I have some nickel plated brass that have been reloaded so much the nickel is worn off and the brass shows through; I treat them the same as nonplated.
I'd say, for now, (and you can use different components when you get used to reloading the .357), get some jacketed 158 gr. bullets (any style), some Unique, and standard small pistol primers and use "tried and true" published loads and techniques...
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