Having shot hogs with a number of different weapons from arrows to 250 grain, .50 cal black-powder rounds, I decided to try a couple different M4 / AR-15 set ups.
I'm in the process of setting up a used Daniel Defense M4 carbine I found in a local pawn shop, chambered in 6.8 SPC. I'm setting it up with a Leupold 3x9 VX-R firedot scope, installed a 3.5 pound trigger and a free float M-Lok handguard. As soon as I have killed some hogs with it I will post my impressions.
In the interim I set up a Daniel Defense M4 short carbine in 5.56. I installed a 3.5 pound CMC trigger, light, and a 1x4 Steiner illuminated reticle scope.
Impressions after killing 5 hogs:
This 202 pound Boar was stopped with a .223 Hornady Full Boar round while on the run with one well placed shot.
Smaller hogs are great targets for a well placed .223
This photo of the thick plate (1" to 1-1/2" thick) covering a large hogs vitals and shoulder is where you don't want to shoot a large hog with a light caliber round.