Hey Bob,
This may be the answer from JB, Mule Deer.
The E-Tip is actually designed to open wider than the TSX, for a little bigger hole and a little less penetration. So far it has done just that. I have seen very few recovered, whether with the 150 at 2800 in the .308, or the 180 at 2900-3100 in a .300 magnum. The internal damage seems to be somewhat more than with a TSX, though not as much as with a Partition or AccuBond.
