Upon skinning the pig we found 2 .243 bullets fully mushroomed and 5 00 buckshot pellets in his shields, those shields were fully 1 1/2" thick or more
Most people have never seen the shields on a full grown boar and have no idea what they can stop.
We took the shields off a 300+ # boar and hung them up and first tried with a arrow at 50 yards. it had penetration but not a pass thru.
then we backed out to 150 yards and then 250 and hit it with a 243 and 30-06.
At 150 they both penetrated but at 250 it almost stopped the 243 from passing thru.
A front on head shot is my go to shot on a large boar if possible.