I think, from what I’ve learned, accuracy shooters historically didn’t want to twist bullets faster than necessary. Seems twisting fast can magnify bullet defects. Bullets today are pretty good and I’m not sure that idea is as prevalent as back in the day, although you sometimes see specialized target barrels with ROT tweaked for a certain bullet.

Faster twist gives more options and I would go faster than factory. 222 may not be a round I’d choose for heavies, but fast twist also does well with conventional bullets. I’d choose an 8 twist over a 12 or 14. I’ve never wished a rifle had slower twist.

DF