Shoot 'em in the ear and it doesn't matter what you use.
I've killed a lot of hogs with .223's... But for multiple targets usually running after the first shot, I have a .308 AR10.
I personally don't hunt with FMJ's on any animal.
Granted I've been lucky but if I hit on running shots the 40 vmax has yet to loose a pig. Hits a bit far back IE guts, it tends to dump em quickly anyway.
No flies on the 308 but there is recoil.