Well, most good ones should anyway. My 18" AR10 clone doesn't have the same range though with comparable ammo. But, I don't know what magic set of sights you have on yours, but the LMTs I use on my AR10 aren't good for much past 600 meters. They run out of adjustment after that. The sights on my M1A NM are good past 1200 meters. And, there is that long sight radius.
My red dots aren't worth a damn past close range. And, I do a lot of unsupported shooting with no bags, packs, sleds, etc. Just a sling. And, I don't shoot much paper. And, as I said before, it's the conditions. Scopes are fragile. (I've wrecked a few.) And, when you add the restriction of milspec ammo, it narrows it down even more. My AR10 clones have .308 win target chambers and won't shoot milspec ammo. Why do I shoot milspec ammo? Because I have a lot of it! I know all AR fanboys think nothing can beat them. And, for most things, I agree. But, there is also the "fun" factor. For some of the shooting I do, that M1A is just more fun.