If you're truly "OCD" about uniformity in reloads, you'll properly full length size your fired cases and forget neck sizing. Virtually all of the benchrest folks did that some years ago. High power match rifle shooters have been doing that since the 1960's. Case necks are straightest on resized cases when the whole case is held in alignment; neck, shoulder and body.
Proper full length sizing didn't change the size of smallest groups fired. But the biggest ones shot shrunk quite a bit. The smaller your biggest groups are, the more often a very tiny one will happen.
Once one understands how bottleneck cases fit the chamber when fired, they'll understand the benefits of correct full length sizing of bottleneck cases. I've always got better accuracy with new cases versus neck only sized ones.