I have great performance on elk out of my 300 WSM with 180gr AB's @ 2970 fps. None at the same range as your harvest; mine were at 70, 175 and 242 yards.
Recovered bullets had expanded to twice the original diameter and retained 90% of their original weight.
He was "beautiful" perfect coloring and form.. The AB has worked for me now on several elk, but the Partition worked great for decades. Again congratulations.