On their site a few years back Barnes had Test Tubes cut down the middle to show the disruption, the bullet was the .308 130 TTSX. Even though the 2000 fps impact test bullet was fully opened the path looked like a pencil wound. OTOH the TTSX that impacted at 2300 showed a huge wound channel.
With a non-fragmenting bullet opening fully isn't enough, it has to be going fast enough to throw away and tear tissue from the impacted area. IOW speed kills.
That's been my experience with them also. Sometimes though, even a lot of impact speed doesn't result in big holes, but usually it does. Not consistent enough for me to use in small calibers for lung shooting anymore.
