I Scenar'd this fellow earlier last fall.
While punched through both lungs, he took a few minutes to die. Autopsy showed that it passed through with about a .8" exit - both lungs had same size hole in them and very little evident trauma. No ribs or other bones hit. (Impact vel. ~ 2300)
I think a bit more velocity and hitting bone or thicker critter hide would be perfect.
Probably use this bullet again this year outta a '06.