Are you trying to say that the 280 has a longer action than the 7MM Mag and 30-06? Debates between bullet sizez do not mean much umless you also know the velocity and SD of the bullet as well. If you use a 7MM bullet with a SD of 266 like the 150 grain Barnes and a 30 caliber bullet of the Same SD, in this case the 168 grain is very close, start them both a 2800 fps and at 400 yards, the 30 caliber bullet will have 120 lb more retained ME. The 30 caliber bullet is a bit heavier but both bullets have the same SD with the 7MM having a tiny edge. In the end the 30 galiber will perform a bit better because heavier bullets are available.This again with bullets of the same SD and equal velocity.