Water is extremely an tough medium for bullets and in no way will represent what to expect from tissue. Think of a bullet shot into water as an over expansion scenario. They won't expand that much from lung shots at the same velocity.
So while those TSX's and TTSX's look "good" from sub 2,000 FPS impacts into water, they don't expand nearly (if at all) as much in straight lung shots sub 2,000fps.
Also downloading the velocity to simulate a far impact speed at close range will produce different results than if actually launched at full velocity and the impact is at long range. Sometimes the difference is minor and sometimes the difference can be quite apparent.
