I have to admit, I was kind of nervous about using the Barnes TTSX after reading about some of the expansion and penetration problems some people had posted, but they performed flawlessly against my moose.
I bullet passed through the shoulder, ribcage, heart, then the other side in reverse order with a complete passthrough. The damage to the heart was massive with two of the chambers blown out. This shot was from a Browning 300WSM using 180gr Barnes TTSX bullets. Needless to say, he didnt go far.