The hunting line is what most of the Long-range Benchrest shooters use in there 600/1000 yard chamberings because the jackets are more concentric.
If you are a Competitive Shooter you only switch to the target bullets if you are experiencing failures.
Friction is what caused the failures not rotational forces.
Bullet length all else the same determines twist rate not velocity.
If your gyroscopic stability is 1.5 it doesn't matter what velocity your shooting because a 1.5 GS means the bullet is stable.

The only time twist rate comes into play is guys with a GS of 1.2 shooting 1000 yards and maximum loads in a very long barreled 308.
They are already on the edge and small variances can mean big trouble quickly.
The guys winning Benchrest matches at 1000 yards with the 6 Dasher are using 8.3-8.7 twist barrels and 103-108 grain bullets. When asked about there twist most just say 8 twist to avoid confusion.