Sakoluvr,

That's exactly what they do in TTSX's. The hole for the shank of the plastic tip is much larger than the hollow-point of the smaller caliber TSX's.

A bigger hollow-point in the smaller-caliber TSX's would reduce ballistic coefficient noticeably.

“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck