I'm getting ready to send a Rem 700 .223 action to be barreled to 6x45. Trying to decide on a twist rate....8,9,10,12 and 14 are all offered in 6mm. Looking to usually be under 100 grains bullet weight, mostly in the 70-100 grain range. What would be the best twist rate?

Thanks,
Rob

Look here: http://www.z-hat.com/twistrate.htm

I'm running a 1-8" twist and wouldn't change it. I also have a 6x47 (222 Remington mag case) coming that is also 1-8" twist.

Yep 1-8"