If you are willing to do a bit of reading this website has extensive information on bullet performance in real life hunting situations. Lots of actual photos etc. There is also a very long article that covers well the considerations in bullet design and construction for effective hunting bullets. Far more info than a guy would be willing to type out as an answer to this question.
Like most, I believe you need penetration and expansion for the optimal job. Ideally it should not be one or the other.
https://www.ballisticstudies.com/Kno...e+Killing.html