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Unless this brass is way, way out of spec, I think you're going to be okay with loading the bullet long so the case fireforms correctly.
As Smokey Joe stated, once you fireform the brass, you should be okay with neck sizing after that point.
I've never used the premium stuff and for the time it takes to segregate maybe I'd be ahead of the game, but I typically resize it, trim it if it needs to be, clean the flash hole burr, segregate by weight, and normally load a heavy weight bullet with a minimum charge long so it puts the case head where it should be and fireform.
Is there a better way?
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