I've only taken three wild boars (2 in northern Calif and 1 in Penna) so I'm no expert. All were taken with my 30-30 Marlin at approx. 80 yards or so. First boar was shot low in the chest. The animal took off like a rabbit but toppled after about 50 yards. My bullet tore off the bottom half of the heart. Next two boars were shot in the head and dropped so fast that I thought I'd missed! I hunted with 170 grain Winchester Power Point ammo.
I suggest the head shot if you get a good steady rest aim.
Fire up the grill! Deer hunting IS NOT catch and release.