I have always took broadside or quartering away shots with no problem.mo hogs do not have enought shield to worry about.if it is a big boar,then you will deffiently need a quartering away shot.
Other than the shield on a BIG boar,a hog vitals are just like a deer.the shield is a cartlidge that boars have to protect them from other boars tusk.it is tough,but should be no problem with a good sharp broadhead.
If you are shooting mechinals,make sure you have enough KE to do the job. try for the quarting away,or just a little behind the shoulder.

hope you get a shot at that big one,send pic's. GOOD LUCK !!

I am not a hunter I am a whitetail population reduction specialest

remember keep your back to the sun, your knife sharp, and your powder dry.