Id strongly suggest,after 5 decades of hunting hogs,
if your using buckshot stick to double ought shot size ,
and under about 35 yards in range if you intend on getting good results
http://www.grumpysperformance.com/jan18/dd9908.jpg
thats been good advice even when I use my 10 ga semi auto ithaca
a
1 3/4OZ slug loaded for stationary first shots followed by two 18 pellets 00 buckshot shells in the magazine
http://www.grumpysperformance.com/jan18/CIMG0064.jpg
a 12 ga works, but it's not quite as effective especially once ranges exceed 35 yards
now obviously smaller hogs under let's say 100 lbs maybe a bit easier to kill
than larger versions but most hogs are shot in fairly thick brush
and can go some distance once wounded, you don,t want to lose many with less than quickly lethal wounds