Had my first grizly client with bergers this year. Five rounds into a grizz from a 338 rum. Didn't break a single bone but blew up the insides of that bear. We found flakes of metal all over in that thing! I'd never use those bullets after seeing that. That being said accubond....not to much better from what I've seen.
A Berger would be about the last thing I'd shoot at a grizzly.