Interested to see that bullet. I had less than stellar results with ELD-X this year; one bounced off a rib and then grenaded off the inside of the sternum, and the second shot passed through the heart, out the other side, striking a leg as it went, without opening up at all. The first (grenaded) one weighed 97grs (of a 140gr bullet) and was found buried against the opposite side hide. The doe would have bled out eventually (she sat down, and her chest cavity was filling with blood), but it would have taken a while. I just put a second shot into her to end it quickly.
Sierras are on my list as a replacement. The ELD-X acted too much like the SST's of old (erratic performance on game).
BTW, it was a large doe that dressed out over 150lbs, so it should have been big enough/wide enough for the round to expand and do it's job. Even at 265yds.