Thanks, carriage-hill. Have you used ammoman?
Yes, I get email notices from them on 5.56/.223 and 7.62x51 sales, and buy cases. They don’t charge shipping, either. Be sure to sign-up for email notification and you can get in on some sale lots. I’ve built-up my “ammo dump” supply, for 8 calibers, in the several hundred thousands of rounds, since late-2001, right after 9-11. Ammo Broker’s a good comparison source, too.