I have had two instances where Nosler Combined Technology slugs (partitions) hit a rib going in on elk and never touched the far side of the body cavity. Both were 30 caliber 180 grainers starting out at about 3,400+ ft per sec from a Weatherby 30-378. I think that's just a bit too fast for that construction. Both bulls died within a few feet shortly there after, so I can't say they were inadequate.
