re: Recommend me an AR, preferably larger than a .223

My cousin built a 6.8 heli hunting gun for the exact reason you mentioned. How often do you think anyone puts 5 hits on a running pig with any caliber? He has killed hundreds of hogs and he has shot 300blk and 556 and has settled on 6.8 as his pig extinguisher because when it hits, it puts them down.

It is an OB Baller round cost wise though

I personally like 300blk because of the popularity and ammo choices right now. Going with an AR-15 platform vs a ar-10 (.308 ar) platform lends many advantages for multiple calipers run off the same lower receiver as well.