My preference, which has been proven a few times, is a .44 Ruger SB with the 7-3/4" bll. I carry mine in a custom cross draw, break out, holster with the cylinder just above my hip/belt.
That setup evovled from quick draw shooting. Second best is slung on the thigh and tied. The grip should be where your natural reach is, tieing it down keeps the holster from rising with the pistol. There are 1000 more things for quick draw competition but you're just trying to SYA when hog hunting.
BTW, practice your defense as much or more as your offense, a large wild animal charging you IS challenging.