Dave,
I wouldn't be real wild about the idea but I do know of several 338-378 Wby single shot 700's around. I have never chambered a Kahn. I am sure Kirby will see this and give us the 411. I would recommend the Edge streight up, but realize that I have a personel bias toward it. No matter who you have build it I would recommend it for a 700 platform for many reasons. For a 700 action I don't think you can beat the economy, ease of loading, power, capacity, feeding over a super mag size round and the accuracy success I have had with them. Like I said, I have a bit of a bias toward them.