In this discussion I am not interested in rifles as they have a lot more velocity to work with and the dynamic is completely different. Revolver bullets by comparison are lumbering. Nowadays, I hunt almost exclusively with handguns, and I can assure you that two holes are better than one. I consider a bullet that doesn't exit a failure.
I have shot hogs with my .416 Remington (the rifle in my signature picture), my .458 Lott, and a slew of other calibers, and they kill no better or faster than my .454, .475, .500 LInebaugh, .500 JRH, etc. despite the muzzle energy "advantage" they enjoy. I have seen pigs that were shot not bleed or stop bleeding because the hole closes up (fat, hair, etc.). Make two holes and your tracking will be a lot easier and the animal will bleed out faster.
Not trying to be argumentative, but there still is no replacement for placement. A poorly shot hog can live on and absorb a lot of lead for a period of time. Hit 'em right, and collect the carcass. Here's one I shot last month......320 grain WFN -- two holes, and a dead hog......