Never had a fast twist hurt accuracy

Case in point. 6BR. Stiller. Bartlein. 1/4" at 200 yds. Both with 66 gr Match bullets, and 105 Amax.

I had a 6TCU done in 12" and later regretted. That was pre-6BRs. My first was a 12. Every BR after that was an 8

In 22, 6, or 6.5 - personally I will always use an 8T. Just my .02.