Monolithic bullets such as Barnes TSX/TTSX, Nosler Etips, etc. will and do fail to adequately expand much more often than softer bullets fail to penetrate. The reason that most don’t see this is because adequate penetration is the most important facet in terminal ballistics and even a small hole through vital organs generally leads to a relatively quick death. The animal does in an acceptable time frame, people see a 1/2” exit hole and believe the bullet is working just like the adds. However, when or if you recover a mono and it looks like a tight, neat little mushroom and you pulled it after it went the length of the animal- that’s the biggest it ever was.
In general, monos exhibit long, relatively narrow wounds and are more likely to “pencil” then any other bullet design. Monos can kill well of course, but in hundreds of animals including depredations, if there is a bullet issue it’s almost always with monolithics.
