I think the issue is less about toughness and more about placing a bullet or broadhead in the vitals. Like many African game and wild hogs, their vitals are lower and farther forward than a whitetails. If you try to center punch lungs back from the shoulder like you do with whitetails, you’re going to more often catch liver-guts. Shoulder shoot them with any big game rifle and they won’t go far. My last archery kill went 15 yds after taking the top of the heart off....