I used partitions for 25 years as well and killed a pile of animals with them.
I cant see any significant difference between performance with an AB and a partition...including penetration.
Caught about the same percentage of partitions as AB's in animals.
I still haven't seen any violent expansion from an AB, even though I was really concerned about from reading the BS, lies. and half truths on the internet. As luck would have it, the first elk I killed with one was the bull at 25 yards...thought it was going to be a disaster. I guess it was violent enough to almost ruin 4 oz of top quality elk rib meat.
