Seems like the prevailing wisdom on twist rates is to not cut it too close, and go with a fast enough twist to guarantee stabalizing the heaviest possible bullet for a given caliber. So, what is the DOWN side of fast twist? Fouling? Wear? Bullet deformation?
In pure accuracy terms, you want the twist that will be just on the “right” side of accuracy with the bullet you have chosen. You want to spin the bullet just enough for stability, but no more.
It is not possible to “over stabilise” a bullet as such, but spinning a bullet faster that is needed is more likely to produce erratic behaviour if there is any defect in the bullet. There is always a degree of compromise in choosing a twist rate for a barrel as there are a number of variables that will affect bullet stability - but that is about a chapter long explanation that I am probably not ideally suited to giving.
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