Both come apart quite a lot on impact, but deer are not that big, and a 30 cal 165 gr
Wyosmith, that's kinda what I am counting on. I could care less if the bullet comes apart on my dear as long as the damage to the vitals is devastating. As long as the bullets make their way to the boiler room and do massive damage I don't see penetration as a problem.
Also I chose the 165 grain over the 150 because I figure I can push them almost as fast and they won't come apart too easy plus they will perform better at long range. Plus my 30-06 really likes any 165 grain I can throw at it.