9.3x62
I've become a recent convert to the 9.3x62mm. I think that it is extremely underrated in the United States. With the right bullets, it is extremely potent. My cousin has a CZ550 in 9.3x62 that he took to Africa a couple of years ago and dropped a kudu, oryx, warthog, and caracal in their tracks. The PH nicknamed it "the laser" because it was so accurate and deadly.
I have a left handed Ruger M77 originally in .30-60 that I got re-barreled to 9.3x62. A couple of weeks ago I shot a 300 pound black bear with it and dropped it in it's tracks. I was in an elevated stand and it was moving directly away from me. I shot him about six inches up from his hips and the bullet exited his throat, traveling almost the length of his body. I was using a 258gr RWS H-Mantel bullet and it penetrated about 28" before exiting, while causing massive internal damage. The RWS bullets are very expensive, but they are well worth the money. They give good terminal performance while penetrating a very long distance. The shape of the bullet also makes good, clean entrance and exit holes that help to ensure that the wound does not close up and continues to leave a good blood trail when you have to track the animal.
The good penetration and performance I observed on this bear, penetrating it's thick, hairy hide and heavy bone, coupled with the performance my cousin experienced, make me feel good using this caliber/bullet combination on anything up to and including moose or eland. It has a pretty good reputation in Africa as well, especially South Africa, Namibia, and Zimbabwe. Due to the high sectional density of the bullets, it penetrates very deeply. Using heavy, controlled expansion or solid bullets, this caliber has cleanly taken many cape buffalo and elephant.