Running a suitable test is next to impossible. Bullet between the ribs will probably penetrate deeper than one that hits a rib: for one example. Best way would be to use cadavers. Or if you were in Nazi Germany in WWII you could use Jews and POWs. Not really practical. (before anyone gets upset, I don't advocate that you use Jews and POWs.)
Essentially the best you can do is read all the tests and choose your round/load based on your own instincts and interpretations.
Cogito, ergo armatum sum