Anybody here have a 22-250 with a fast twist barrel (1:7-9)?

I've got a Ruger No.1-V with a 14 twist that shoots very sweetly, but I'm really curious about launching 68-80gr bullets with 22-250 oomph and how they compare downrange to a 223. I just put a takeoff 9-twist 223 barrel on a 12FV but now I'm thinking about a faster twist 22-250 tube.

I'm sure on paper within 200m it doesn't make much of a difference, but I can't help but think performance on varmints or longer-ranges would be greatly improved by an extra 300-400fps.

Ideally, I'd like to use 50-52gr bullets as well as 68-80gr bullets.