Dont mean to hijack, but if you are going to shoot 180's, why not get a .300 RUM ? I mean it can push a 180, 300+ fps faster. I understand the .284, 180gr VLD has a .659 BC, where as the 185 .30 cal has a .549. But at 1000 yards the speed is almost identicle.
Berger reccomends a 1 in 9 twist for the 180's by the way. It's all on their website Berger Hunting Bullets
Also, here is a PDF quick reference sheet for all the Bergers. Everything you need to know http://www.bergerbullets.com/Berger%...%206-17-09.pdf