Dawgs,
Don't be hasty dismissing Winchester or Remington brass, or hornady either. If you're willing to uniform and deburr flash holes, trim and/or check length and turn the neck for uniformity, you can get great brass.
Sometimes you have to know what you've got. For instance; Remington brass is harder than Nosler brass in the 300 RUM so to get the very highest velocities Rem should be used. For the most part, Winchester has more available volume, is also thinner and harder and better in some applications IMHO.
A good start is to weigh your brass and sort by weight amounts and you'll soon see you'll throw out about 10% right now. Then when you turn brass, some will have very thin necks and must be discarded too.
This is all just to add consistency to your pressure, even velocity and greater accuracy
Some think it totally unnessisary but others think it's SOP for top loads. Only you can decide but regardless, you're headed in the right direction.
Zeke