You cannot compare the paper foot-pounds of energy of a .243 and a .44 Magnum. The real world effect on a boar or large deer inside 50 yards is night and day.
I know a good number of hunters who use a .44 Magnum carbine or handgun to hunt hogs, because they use dogs to track, chase and corner them, and have to have something light weight that is out of their hands or can be shifted from hand to hand as they move through the woods and brush. And they don't want the bullet going through the hog into a dog or richocheting off a rock. They will try for a head-on shot. A friend of mine, now deceased, used a semi-auto Ruger .44 Carbine to great effect.
I carry a .30-30, and a .357 revolver if the woods are thick. If things are more open, I carry a .444 Marlin or a bolt action carbine. When hunting with a bow and arrow, I carry a .357 for backup or dispatch. A friend, who had a very close call with a large, German blood boar trampling him and ripping up his coat while he was trying to get in a shot with his .44 revolver, started carrying a Marlin 336 in .35 Remington.
Another friend and hunting partner, who is a Cowboy Action Shooter, uses his .45 Colt 1892 and Ruger Vaquero, and has taken a good number of large feral hogs - but again, up close. And he is totally comfortable with both firearms in all kinds of firing, left and right handed. When the woods are open, or he is hunting from a stand, he uses his M1 Garand.
If you are hunting in the woods, but not shooting a cornered and angry boat at five yards, get a .444 Marlin. It delivers the impact and has the reach for 100+ yard shots. In the 22-inch barrel rifle, it is handy enough to sling on your back or weave through the woods to get into position for game on the move, as pigs often are.