I can't comment on the "Hybrid" .338 Berger bullet.....not sure if they designed them more for target shooting than hunting. I can relate a similar story to yours..when I was using Sierra MatchKing's. We tried some 100 gr. SMK's in my .25-06 for antelope hunting
. Our experience was...this was the most accurate bullet in windy conditions that we could find. We used this bullet to take two antelope. Both times....the bullet penciled in and out. Inside the chest cavities of both animals was a bunch of mush along with the blood. I'm thinking the hydrostatic pressure did a number on the internals. My load was pushing the bullets 3300-3350 fps....so you got that very distinct thump when the bullet hit home. Both animals went less than 100 yards before they piled up.
Maybe the new "Hybrid" bullet is designed a bit more for long range target shooting and less as a hunting round??
I was happy to read Berger has moved up into .338 cal. bullets. Too bad your experience wasn't what you had expected. I decided to never use the SMK's when big game hunting. I really want something that will have some expansion to it.
Hope there are other guys out there with experience....with this new bullet. Your experience sounds a lot like mine with SMK's. Hopefully I'm barking up the wrong tree..