Yep, those weak partition bullets do come apart on elk and I can prove it. I shot two elk with the .375 partition and both bullets were all mashed up after they went through. The first busted a shoulder, a little bit of spine about two feet long, and you could see that stubby little piece that was left through a tiny slit in the off-side hide of the hindquarter where it had almost penetrated.

The second time the damn bullet got all mashed up on just a leg bone and stopped after only plowing a hole through the heart, lungs, and a couple of feet of intestines and ribs. This one didn't exit either.

Don't know what's wrong with those bullets but I figure if I shoot another half a dozen elk with them maybe I can figure it out.