My buddy shot a large 5pt bull in 2018 with the 143 eldx 6.5 cm, and I shot a small 5pt bull in 2019 with the same. He recovered two perfectly mushroomed bullets and mine never exited but I never found it somewhere in the chest. My bull went down within 25yds, his within 50 yds.We have taken 6 elk total with the 143 eldx with no issue.
I don’t consider a Partition is a cup and core.Recovered from my last California buck taken with cup and core in 2017. 150gr Nosler Partition. 210 yards facing me quartered. Bullet entered right side just behind the front shoulder. Recovered it from the rear left knee. The 4 deer taken since then were blow throughs with TTSXs.