FYI Midway has American Eagle 223 Ammo pretty cheap today. 500 rounds for $168. Cheapest I've seen.
https://www.midwayusa.com/product/9...l-metal-jacket-boat-tail-ammo-can-of-500-bulk
https://www.midwayusa.com/product/9...l-metal-jacket-boat-tail-ammo-can-of-500-bulk