My limited experience using sub sonic 300 blackout on hogs is that when shot in the vitals the animal doesn't even flinch. It just runs off and dies somewhere.
Most of the time I was able to find them assuming there was a blood trail, and they generally don't run that far. But it was very surprising to me that they didn't buckle, they didn't jump, they didn't flinch they didn't do anything that made you think you even get them.