Kimber Montana. 1-9 twist.
This.
I would think you want small action for the weight. The Tikka Superlight from Sportsman's Warehouse is 5 lbs. 12 OZ with an 8 twist at $699. Only problem is you have to purchase it there. They are too stupid to ship to an FFL.
Yeah, nothing quite as svelte as a 223 on a long action (read: abortion).