Building a 7 saum and was just curious if a 8.4 twist would be to fast for the 180 Berger. Bergers web sight shows a 9 twist is needed. Also would like to run the 162 A-max and they show a 8 twist is needed. Barrel finsh length will be 28 or 30 undecided on this. I was leaning toward the 8.4 but can't find much info on weather it may be to fast or not. Looking to see if anbody has any experience with a fast twist 7mm to shed some light on the subject.