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It's been known for decades that the more lugs there are on a bolt, the better it will shoot ammo. . .but only with new cases whose head's ain't perfectly square. This is why George Swenson designed his 4-lug Swing action back in 1972 for the Brits to use shooting arsenal ammo (poor case head squareness, but otherwise very accurate in good lots) in their rifle matches. No handloads nor commercial ammo was/is allowed. Everyone had to shoot the same ammo. It "levels the playing field" according to the Brit's reasoning.
But there's no accuracy degradation of a 2-lug actions when their bolt face is squared up with the chamber axis. They shoot reloads as good as can be had. Although the best of those 2-lug M1 and M14 rebuilt semiauto match rifles would shoot good lots of Federal match ammo inside about 4 inches at 600.
I don't know of any AR or any other semiauto platform that shoots inside 3 inches at 600 yards with any ammo. There are BR (bolt rifle) ones that'll do that with the best handloads.
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