With perfect hits through heart and lungs there is hardly a difference from 6.5x54 Mannlicher-Schoenauer to .416 Rigby, having used both and many more in between. But, less than 50% of the shots at running game are "perfect". See the shot at the little Frischling in Lutz's second video, thought to be a miss at first. Bigger calibers usually leave a more pronounced blood trail and make tracking easier. Of course, if you hit a leg or the snout of a boar only, there is no difference again... Hits in the jaws of wild boar are the most feared by hunters, especially those who do a lot of tracking, as the animals stay mobile until they starve. Somewhere I have photos of such poor critters.