The 100 BT isn't a TSX or Partition, but it's not soft, by any means. The last deer I killed with one was a mature Montana whitetail doe, quartering toward me at about 50 yards, the rifle a .257 Roberts with the 100 loaded to 3050 fps. The bullet hit the shoulder joint and ended up under the hide at the rear of ribcage on the opposite side.

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