Bang on for the Remington 700, probably the most accurate out of the box production rifle in existence. I would opt for 308 or 30/06 over 223 but that's just me
Not my experience. I have a Browning Mauser, Remington 700, and Savage LRPV. The Savage out shoots the Remington and Browning by bunches. The Remington never did better than 1 MOA at the best of times. The Savage will shoot down to 0.2 MOA (three shot groups at 100 meters) and cherry picked better than that. The most accurate Remington is probably the 40-X which is really a custom gun. Even with it they only claim 0.5" three shot groups at 100 yards.