I've shot quite a few deer with the 223. My favorite bullets to date are the 63g Sierra SMP's, and 64g Winchester PP's. I've tried the 60g Partitions, but I'm not too impressed with their performance on deer. They open up too quick, shed their nose section, and drill a 22 caliber hole the remainder of the way through the deer.
As far as stabilizing these bullets in a 1 in 12 twist barrel, they all will stabilize perfectly as long as you start them at a high enough velocity. I've been playing around with the new 65g Sierra BT bullets in my Ruger(1 in 12 twist), and as long as the muzzle velocity is 2750 fps or higher, they also stabilize just fine.
Barrel twist alone doesn't determine if a bullet will stabilize. It's a combination of twist, and velocity. The RPM's you spin a bullet is what stabilizes it. you could stabilize a 100g 22 caliber bullet in a 1 in 12 twist barrel if you could push it fast enough.