Whack instead of whomp

[Double Naught Spy]

gwtx, you said you were making a broadside shot forward of the shoulder, which should be the base of the neck or very top of the thoracic cavity. What vitals are present there? You have the spine and blood vessels as you will be forward of the lungs and heart. As you obviously did not cause any sort of significant damage to the CNS (spine, brainstem, brain) either directly or indirectly, then you are left with damaging blood vessels as your means of bringing the hog down. If you don't hit a major blood vessel, the hog may run a considerable distance before collapsing. Hitting a major blood vessel could still result in a hog running upwards of 100 yards. Otherwise, you have the trachea, esophagus, and muscle tissue. Hitting these may not bring the hog down for a very long time, if at all.

Hitting the shield should be no problem for a bullet going ~2100 fps which is how fast yours should have been going at 170 yards. So if the hog moved forward, you would be into the shoulder and the lungs. Good double lung shots should bring down the hog pretty quickly. Poor, clipping, lung shots may not bring down the hog or not bring it down very fast at all. It can take a long time for the lungs to fill with blood to cause asphyxiation.

If he survived, hopefully you will get another shot. Otherwise, he may be dead, but way over on your neighbor's property.

You may have hit pretty much where you were aiming, but simply failed to damage anything that would result in immediate or very fast incapacitation. Neck shots can be sort of all or none like that.