My .308 AR is scoped. My range only goes out to 200 yards. I haven't shot it longer yet, but that's what it's for. I put a Nikon M-308 with the Nikon mount. BDC reticle for when I eventually stretch its legs. I've used a rVortex ed/green dot sight with doubler on it, but went with the higher magnification scope for permanent solution.
I just bought the M308 with the mount. Haven't mounted it yet. The rifle has the Troy 45 degree iron sights.
My other 308 has a Leupold VX-1 4-12 on it. Consistent headshots at 300 and holds zero. Love that thing