No personal experience. But there have been many people who have conducted these tests and they all came to the same conclusion. I've read comments by Phil Shoemaker here and read a good article by Finn Aagaard related to his bullet testing on African game. There used to be a good article online conducted by the Alaska F&G concerning their recommendation for large bear protection that I can no longer find. The 200 or 220 gr Partition in either 30-06 or 300 magnum gave the deepest penetration of any 30 caliber tested.
Aagaard and the Alaska F&G also tested many other cartridges. The 30-06 and 300 mag with those bullets tied in penetration and beat every other bullet and cartridge tested smaller than 375 mag. That included 338 WM, 35 Whelen, and 45-70. The Alaska F&G study recommended 30-06 with 200 or 220 gr bullets as the best choice for most people for bear defense. The 375 and larger magnum cartridges beat 30-06, but they felt the recoil could be an issue for some people and they felt the 30-06 was adequate.
