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The most important thing for an AR load is that it feeds from the magazine. Other than that, accuracy works the same way as it would for any bolt gun. Especially if the AR is running with a custom barrel. About the only thing different is the gas port.
The port could shave a bit of brass off. Whether that effects accuracy or not is debatable.
Gas bleed off to work the action may effect muzzle velocity. But that should be a consistent thing. Also the bullet is long gone before the action starts to move.
ARs have been known to shoot as well as just about any bolt rifle. Heavy bench rest rifles probably do a bit better. It comes down to whether you treat the rifle like a bullet hose or a precision shooter.
I've got a brass catcher to help reduce losing cases. 300/221 cases take time to form from 223 if all you have is a single stage press. So I just want it to last as long as practical before risking a neck or head separation. Brass stuck in the chamber can ruin your day when another round feeds into it.
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