Twist has nothing to do with how a rifle shoots at range Phil.
It has everything to do with stabilising a bullet and is derived via a calculation of bullet length, weight, diameter and operating velocity.
Repeated shooting at a range requires generally speaking a heavier barrel but it's only a generalisation.
The theory is that as a barrel heats, the thicker one will not move. It's a bit of an assumption really because any barrel no matter how thick if not stress relieved properly will move as heat increases.