bigger is better.
I picked the 257 because I have shot plenty with both the AR and 257. Pigs aren't hard to kill but they just don't bleed profusely from little holes. Stationary targets are easy to roll over but after the first shot they run.
As with anything others have different experiences.
I assume the reason you are hunting the hogs is for table fare as much as fun so thats why I point you to the heavier bullets...just my opinion.
As I've stated before when hog hunting I choose bigger bullets, but my passion is predators so AR's are in my hands when coyotes are the target. I do see hogs when hunting coyotes and shoot them on sight; every one I see and if they die right there fine but if they run off...fine too. They are a destructive animal.
This coming weekend me and a buddy (my gunsmith) are gonna try out an AR he built for me in 6SPC (6.8SPC necked down) on hogs. I can't wait and this may be the best of both worlds...wish us luck
45-70 Marlin Guide Gun.