Natchez has a $20 off $150 worth of ammo right now. You can get 26 boxes of IMI 62gr XM855 for $155. The $20 coupon will cover most of your shipping if not all your shipping. Then submit the $.05 per round rebate to Federal. That nets you XM855 for $.24 a round delivered.
You can do 2 submissions during the rebate so even if you have already sent one in you can do it again.
Federal Independence XM855 Ammunition 5.56mm 62gr FMJ 3020 fps 20/ct - Rifle Ammo - Ammunition | Natchez