I was just circling back to where this all began as it had turned into a personal 'death' match (for whatever reason) about who is a pretender, wanna-be, not-really-a-hunter thread. I hate that. I was just trying to inject some humor into what had become a 'humorless' exchange.
If I was hunting something else (moose? sheep?) and had an ELD-X in the gun and had to shoot a Griz in self-defense, I'd hope it would penetrate deep enough to do the deed. Cup and core bullets have worked on the big bears prior to the arrival of partitioned/mono-core/bonded bullets. It certainly should be better than a 10mm in that role. But I also totally understand the carrying of a properly loaded (hard-cast, 200grain) 10mm as a last-ditch, save your life tool. There are many accounts of the 'wrong' gun working to thwart bear attacks. Something in hand always beats nothing.
I've never hunted grizzly or brown bear. I have seen them 'for real' (thank you Yellowstone!) and would feel more comfortable hunting them if I was using a premium, controlled expansion bullet such as a Nosler Partition, Barnes TSX/TTSX, Hammer Hunter, Swift A-Frame, Trophy Bonded Bear Claw, or one of the "bonded" bullets such as the Swift Scirocco, Remington Core-Lokt Ultra, Norma Oryx, Winchester Power Max, Nosler Accubond, Federal Fusion, Hornady Interbond, Speer Deep Curl.
In the realm of hunting, outside of using solids for elephants, rhinos, and cape buffalo, can a person ever really go wrong using the Nosler Partition? It's the 'standard' by which all other hunting bullets are measured, so that just seems like the way to go, when in doubt. It works on everything.
Let's all just electronically shake hands, agree to disagree, and move on. Good people shouldn't attack other good people over something like this. The OP will shoot what he wants to shoot. Then he can tell us how it went. Or we can read about how the grizzly ate him after he shot it with a .22 Stinger, because someone on a forum said it would work.