.223

1000 rounds - 223 Rem 55 Grain FMJ Wolf WPA PolyFormance or Military Classic Steel Case Ammo made by Barnaul | SGAmmo.com ($219.90 + $16 shipping) - http://www.sgammo.com/product/223-556mm-ammo/1000-rounds-223-rem-55-grain-fmj-wolf-wpa-polyformance-or-military-classic-st
 * "2x500 round cases, 1000 rounds total of 223 Rem 55 Grain FMJ Wolf WPA PolyFormance or Military Classic Steel Case Ammo made by Barnaul"
 * "steel case Russian made low cost 223 Rem ammunition in the USA. This ammo features a polymer coated steel case for smooth feeding and extraction in your AR-15 rifle. Using steel case ammo saves you money as it is much less expensive than brass case ammunition. This ammo is 100% non-corrosive, non-reloadable primer, and features a 55 grain lead core bullet with an alloy 'bi-metal' jacket that makes the projectile magnetic."

Throwback Thursday—Shooting Steel Cased Ammo In Your AR-15 - http://blog.cheaperthandirt.com/shooting-steel-cased-ammunition-in-your-ar-15/