Somewhere in my mans room is a magazine with an article about Moose hunting in Sweden. The jist of the article was a study done by the Swedeish Game Departmment, in which their officers went with hunters who shot Moose with different rifles and cartridges, and actually measured how far they went after the first shot and any follow up shots. IIRC this was done on at least 1000 Moose. They found 6.5x55's killed just as well and many times quicker than larger daimeter and more powerfull rounds. The exception was IIRC the 358 Norma (or some such round) and then it was only marginally better. It was a very interesting read, and the number of animals killed was a certainly adequate to prove or disprove a point.
I know that some of you guys saw that article, as it has been hashed out here before. Thee Moose I've seen out West, I could kill with a 22 pistol.