Probably have to settle for one in 30-06. I guess things could be worse.
Take another look at the rifle and its specifications. The long action 8400 chambered in the standard 30-06 length rounds are built on magnum actions. The rifles are an inch longer than the 8400's chambered for the WSM's and a half pound heavier!
Consider an 8400 Montana in 300 WSM as its only 6.3 lbs.
http://www.kimberamerica.com/rifles/8400/8400_montana_wsm/I am a fan of the Kimber rifles and have them in the 84M and 8400 WSM.
