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IMO it is not needed, I have loaded .357 bullets in 9mm and .357sig in both diameters - .357 and the same bullets sized trough LEE sizing die to .355 with identical results. So yes, you can size them down ( jacketed as well as plated or lead) to .355 or leave them in .357.
Another thing to consider is the real bore of your pistol, I have noticed that when I slugged my barrels, the dimensions between 7 barrels I have ( 9mm Luger and .357sig ) vary from .3545 to .358
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