Question number one, does it use the same BCG as a 556 AR?
Ballistics what does it compare to?
gets you kinda close to a hypothetical .277-.308 wildcat
My take on it is that the 6.8SPC and 6.5Grendel are, far and away, the most capable intermediate cartridges to ever get SAAMI approval. 6.8 gets the nod for <=18, 6.5 >=20", pick your preference in between.
PSA has an upper on sale for $299 should I get it to use for deer and pigs?
I can't speak to the quality of a PSA 6.8 barrel, and have no idea who makes them (edit: unless they say CHF -- then it's FN). My standard recommendation would be ARPerformance barrels for price/performance. Get the bolt from them too.