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No need to size if you measure 20 random bullets and they all measure within .0001" of what you want them to be. For my 9mm guns, that means a diameter between .357" and .358". Much bigger than that, and I begin to have chambering problems in some thicker walled cases with some of my picky guns.
I've found that the steel molds give me more consistent size results than the aluminum molds. But I shoot many bullets from aluminum molds without sizing as well, such as Lee's TL452-230-2R. Pistols are easy.
I always size rifle hunting bullets, those that need gas checks, and when I need extreme accuracy.
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