That is the consensus. Besides, the mini chambers the AH\SKS round, no 800 yard round. Semi .308 rifles cost money and are relatively heavy. You can buy junk that skirts one of those two, but don't. M1A or high end AR-10 rifles come to mind for good equipment.
Me, I have a .308 tactical bolt rifle. And two ARs to defend the bolt rifles position. Either you need one well placed shot, or you need a squad...
I agree about the "cost money" part, but the Springfield M1A SOCOM-16 is fairly light, and very handy and quite pleasant to shoot (with ear protection). With a 1x electronic sight, it's a plinker on steroids. I have complete confidence in mine up to 300 yards. After that, my eyes need help before my M1A does. The rifle is willing, but the eyes are weak.
Effective fire on a point target at 800 yards, as opposed to mass volley fire, requires a serious rifle with a serious scope, and some serious practice. You can probably save $400 by going with a quality bolt action, rather than semiauto, but you still need the same scope, and the same amount of practice.
Shots at 800 yards, outside of mountains and open plains, are few and far between. It's the "big leagues" of rifle shooting, and you have to gear up for it appropriately.