I agree, if you can get the boar to stand still long enough to make that shot into its ear. Some boar hunters want to mount the heads for trophies, and this shot is not an option. The bigger target is the Heart/Lung area of the upper chest, which is protected from the sides by stout leg and shoulder bones, and a very thick shoulder blade. We had two archers shoot pigs with their setups for hunting deer, and neither broadhead penetrated the shoulder blade. We did have a one shot kill with B&A, with the archer using a compound bow, heavy Easton arrow shaft designed for hunting Elk, straight fletched 4 feathers, and 4 bladed( heavy) broadhead. The arrow penetrated the boar at 20 yds., entering the left side just behind the ball socket for the shoulder, cutting through both lungs, and apparently cutting an aorta, and then nicking the shoulder joint on the right shoudler before exiting. It was the only one shot kill of a boar with bow and arrow in the history of the game preserve where the hunt took place, in Tennessee, to that date. In the post-mortums of the two deer that were not killed by the hunters using lighter gear, we determined that it was the helical fletching, which cause the broadhead to turn, or rotate, as it was going through the flesh that stopped the arrows from penetrating the heavy shoulder blades, and not the condition of the broadhead, the draw weight of the bows, or the weight of the shaft. The rotation caused the sides of the broadhead blades to rub against the boney shoulder blade, bringing the arrow to an abrupt halt. We could see the evidence of the twisting motion in the wound in the shoulder blades.
The owner of the preserve was so impressed with that archery kill that he announced that future archery hunters would be advised to set up their arrows with straight fletching. Because most hunters are going to have a shot at the chest area of a boar, much more likely than a shot through the ear, it makes sense to discuss what will stop a large boar with a chest shot. I recommended the use of conicals after seeing the results of using round balls in chest hits. I know of two boars that were killed with chest hits from one shot each, but both took almost a minute to finally drop. At the close ranges we shoot boar, he can still hurt you as he is dying. I had a good shot at the ear of my second boar, but it was a trail above me, and I would have had to shoot through its jaw bone to hit the brain, not through the ear. I didn't want to take the chance of the ball being turned by those bones.