Dead wrong. Some of the most accurate, yes benchrest winning guns don't have turned necks.

1) Case fit to chamber
2) Bullet fit to throat
3) Charge to charge variation
4) Bullet match to twist

Turning necks is a misnomer because all BR guys used to do it. Powder variation is also a misnomer because BR guys don't weigh. They don't weigh because high end measures are more accurate than a scale. They just add a click or remove a click. They also use heavy BR actions. Accuracy will suck before the action fails.