I have used a 450/400 NE 3" Hornady DGX non-bonded for a black bear hunt this spring.
As expected, the jacket separated after impact, disintegrated and became a bunch of shrapnel inside the chest cavity. The inside damage was extensive. I have found pieces of the jacket in the exit shoulder. The core exited without much meat damage.
The bear sprinted 2-3 steps after impact, spun around, dropped and died without a moan. By the time I found the second trigger it was all done. Second shot was not required.
It was a 20 yards quarter away shot.
A buddy of mine took a quarter towards shot at the same distance (or slightly closer) with a slug 20Ga and after a long tracking with a dog, we have failed recovering that bear.
Last year I have used a 9.3x62 Hornady 286gr and it worked just fine, but not as effective. The sprint was significantly longer and included the moan.
That bear was also half the size of this one.
I remember Elmer Keith highly recommending the 450/400 NE for bears and he wasn't talking about black bears. But for me it worked wonderfully and I very much doubt I'll use anything else while I have a 450/400. It's also a good close distance practice.
(For black bears the non-bonded DGX works great, but wouldn't use it for heavy game in Africa. A friend of mine used my rifle in Africa with DGX non-bonded for cape buffalo and almost lost it. That was 2015 before we knew any better. The DGS worked fine though).
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