That's a reasonable approach, but simpler might just be to look for an impact velocity of around 2000/2100 FPS. Barnes seems to think that below that TSX/TTSX don't open so well. If they don't open they won't cavitate and then you have problems. C & C bullets have minimum impact velocities for the same reason but they usually are not as easy to get.
Are you sure that the TTSX won't open up below 2000 fps? I know the TSX is said to have that boundary, but I hadn't heard anything about the TTSX...
