I think JB touched on the 300 H&H/300 WSM test in one of his Gun Gack books.
Charlie I don't think we need any more calibers either. A deer is still just a deer the same as they were in the days of Jack O Connor and Elmer Keith. I drank the Creedmore Kool Aid briefly . Didn't care for the rifle it was in and wasn't impressed enough to buy reloading dies. I sold it and had a 6.5X55 built and I love it. My last three custom rifles are in classic time proven calibers. The Swede, a 38-55 on a high wall action and a 300 H&H on a #1. If it's not broken stop trying to fix it.