Bulk ammo is really a expression accustomed to buy ammunition in bins or cases. Purchasing ammo in bulk is a great way to save your time & money on your favorite ammo. Bulk ammunition may be within the case and box packaging. Bulk ammo is often accessible in well known calibers such as 9mm, 5.56mm, .forty S&W, .forty five ACP, and .223/five.56mm, h