I, and a couple of the guys around here have shot my 12.5" barrel AR-10 SBR. The combination of a good muzzle device (AAC brakeout on mine) and a heavy buffer (heavybuffers.com Car10-XH), make it shoot as smooth as any 5.56 rifle. I'll let the other guys collaborate my statement. But, it's pretty easy to get a smooth running 7.62 rifle if you're willing to "play" with some of the components.
AND, they'll all hate you (flip you off constantly) for the Elcan that you end up putting on top of the damn thing. <lmao>
I guess that's why I'm an Enabler.