I have a Kimber Montana in .338 Federal. I love the rifle but unfortunatly Kimber's quality control sucks and both the original rifle, and the replacement they sent me, have rough cut chambers. The rifle itself is a great design and a pleasure to carry on all day hunts over rough terrain. The cartridge is also adequate for most game and did a great job on the elk I took with it last year.
Personally, I would choose the Montana in .338 Federal. It's lighter, has a short action, and bigger bore with comparable velocity, energy, and trajectory to the .30-06.