The bullet in the photo I posted smashed through heavy bone and is expanded nearly to the bottom of the hollow point, it could not have expanded further. Also notice the front groove of the recovered bullet is in line with the front groove of the one that is loaded so you can tell how little of the front of the bullet can open and expand.
I believe Barnes should make the hollow in the point deeper so the bullet could expand to a larger frontal area.
I have never used the 120 TTSX, can't comment on the difference in construction but the expansion in your photos looks like I expected the 140s to expand.
