Gain twist barrels

[Timetoshoot]

I will be replacing two barrels soon. I understand concept of gain twist not clear on deciding when to use it. I’m planning to go left hand twist based on my remedial understanding of Coriolis , Spin Drift.

Is there any advantage on a 24 inch match gun launching 6.5 123-130grain bullets at 2870-2950fps to go with gain twist?

Is there any advantage on a 22inch hunting gun launching 6.5 130-140grain bullets at 3000 to 3100fps to go with gain twist?

Both barrels will be PVA Tikka prefit.