Best advice has to be ... select a twist rate compatable with the bullet(s) you will use. Think about the wisdom of choosing a proper fitting box-end wrench instead of visegrips. Both are capable of doing the job, but the proper fit will probably serve you better.
Seriously, most shooters are fine with the performance they get from a fast twist barrel. I always choose a 17:1 twist for 115gr 30 cal to be shot in a 30BR. I have no doubt that bullet would perform “OK” when shot from a 12:1 twist barrel...but I would not expect sub 1/2 MOA groups....which I know will be a reality for the 17 twist.
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