Bottom line is that the case necks really, really, really need to be consistent. Not from an accuracy standpoint but from a usage standpoint. I would challenge anyone to display the accuracy deal but will not question the overall use of the cases in terms of when you need to go to a smaller bushing for sizing. Remember that the cases need to have a grip on the bullet to effect some sort of seating depth. If they are different, you'll have a problem deciding when to go to a smaller bushing. That in itself is not a "real" problem but mentally it becomes a huge problem.
The bottom line is that your cases need to be within half a thousandths less then the chamber size all around - or more. Accuracy wise it doesn't matter if they are more but I don't recommend less unless you measure them regularly. Measuring them at the recommended thickness is good as well but you don't need to measure them as much. Frankly, case necks get thicker more than they get thinner and you need to keep an eye on the thickness lest you run into a "bigger case than chamber" kind of deal.
If you turn the necks and they are different thickness but will "fit" the chamber, by all means shoot them without reservation. In time, you'll see what I'm trying to say and the lesson will be learned. You can, and many do successfully, turn up a new batch for every match.
BTW - If you'll pay attention, the guys that win regularly have enough money to buy enough barrels to find one that works. How they turn their necks may not have anything to do with their success...I could be wrong...