You are using the 7MM 180 Grain Hybrid Target bullet as best I can determine.
I looked on the Berger website and found no Hybrid hunting bullet, a VLD hunting bullet but no Hybrid. If you have a Berger Hybrid Hunting bullet when did you buy them, and have they been discontinued?
Target bullets are not designed to expand, penetrate and so on as a hunting bullet. They are designed for accuracy. They work very well in that regard, and many people use them for hunting because of the accuracy but not the best tool for the intended job.
Dangerous game bullets are solids, designed for a specific purpose and they work for that intended purpose? They are designed to penetrate tough hides, dense bone, used in larger caliber rifles (.375+), heavier bullets, at fairly close distances.
Is there any bullet manufacturer that recommends their target bullet for hunting, and perhaps make statement advising against such use?
Within this thread there two examples, one with pictures, of when targets bullets fail as hunting bullets.
Yes, all bullets no matter what the designed intended use can and do fail to perform.
Target bullets will work for hunting .....until...... they don't.
Thankfully both of the examples that I read of on this thread recovered the animals. How many were not recovered, and not talked about?
Perhaps you would be better served to develop a load with the Berger VLD Hunting bullet.