The bullet on the left is what is left of a Nosler 6.5 125gr Partition. It weights 83grs after almost passing thru a mature muley buck & has expanded to about 33cal. . It struck no bone & was recovered under the hide on the opposite side. The deer went down so you would have to say the bullet worked. The buck was about 80yds away & the bullet was launched from a 260 Rem @ 2950 FPS.
The bullet to the right is a Barnes 120gr TSX recovered from the dirt back stop behind my 100yd. target. It was fired from a 6.5-06 at 3235FPS. It expanded to 50cal & still weights 120gr. Years ago I relied a lot on the partition but due to what I see as a superior design I now only use the homogeneous copper bullets like the Barnes TSX & TTSX on elk. I have used the Barnes for years now on heavy game like elk with complete success & have yet to recover a bullet , so I can't display a recovered one. Like wise when the Barnes 6.5 TTSX100gr is used on mature deer it dependably passes completely thru. They perform like a bullet considerably heavier because they tend to retain 100% of their weight. For me this is confidence.
Another point is that if a meaty part is inadvertently struck a C&C bullet like the Nosler & others can destroy large amounts of edible meat. The homogeneous copper bullets tend to keep meat destruction to a minim if struck. Since my main reason for hunting is the food source I very muck appreciate the copper bullets.