High-volume shooters love the performance of Winchester(R) White Box Ammo. It features top-quality Winchester components and that means you get fabulous reliability, flawless functioning and exceptional accuracy, all at a price that won't put bullet holes in your budget. It does not expand on impact, which makes it great for target shooting. Get some and get on the range. Made in USA. NOTE: While the 5.56x45mm NATO will fit in a .223 Remington chamber, 5.56 is a military round that runs at higher pressures and is not recommended to be fired in .223 Remington chambers.