Mate, I cant help you specifically with bears from first hand experience, but I think the average black bear will die very quickly with that load.
My only experience with the ELD-X is on fallow the weekend before last. My son used a handload in his 308Win. The 178gn leaving the muzzle at 2630fps. Shot a doe at 100 meters and a buck at 160 meters.
Terminal performance on both shots showed the bullets to be quite fragmenting. The doe had a calibre size entry and about a 2" exit hole. Heart & lungs were shredded and the chest cavity was full of blood. The doe ran approximately 20 paces, but left a blood trail Stevie Wonder could follow.
On the buck, the shot was high shoulder, so the heart was not hit, but the lungs were shredded and he dropped on the spot. The biggest surprise to me was the volume of blood on the ground around the exit hole.
Photo of the doe carcass in the meat shed:
The blood on the ground from the exit on the buck. I left my shadow in the picture to give some reference as to the size of the blood puddle. It was more than I have ever seen in one spot on the ground like that from any exit wound: