Shooting on a tight budget? Go for Gold. Wolf® Gold Ammo is inexpensive but ultimately reliable—probably why it's a favorite among high-volume shooters all over the country. "M855" is the designation giving to the steel-core 62-grain projectile designed for field use in the M16A2. The M855 round is an outstanding choice for hogs and other types of hunting in thick cover.
NOTE: While the 5.56x45mm NATO round will fit in a .223 Remington chamber, 5.56 NATO is a military round that runs at higher pressures, and is not recommended for use in .223 Remington chambers.