Rick, The 8 twist 270's with the 180 grainers may very well be the future.
Right now it's hard (not impossible) to top the 6, 6.5 and 7 mil for nice long range bullets.
If you haven't already, check out this website. Matrix Bullets are making some waves in F Class competition. The owner is a great guy too.
http://www.matrixballistics.com/You might be surprised in which competitions his 270 bullets make an appearance this year.
