Could not agree more, I own two 340s and several 30 caliber magnums. However I purchased a .280 Rem and a 7mm-08 for my two boys and have been really impressed with both of them. Not that I am about to settle for something less than a 30 caliber but I am starting to have somewhat of an appreciation for those that do.My favorite caliber if I could only have one would be a .338. I have a .340 Weatherby and have shot everything from rabbits to African plains game with it. And I would not be scared to go up against the African big 5 with it and a proper load. You can load it up or down to suit your needs. It is a 1000 yard rifle if needed and you can do your part. It is just one of the best all around rifle calibers out there with no disrespect to the .30 caliber rifles out there.
I did some reading on the 6.5x300 Weatherby and it sounds like it is going to be a very fun barrel burner.However,,,, the new 30 Nosler and 6.5 x.300 may be worth a look.
How's that for throwing fuel on a fire, I mean discussion.