Rounding Out Plano's Introductory Level Of Field Boxes, The Field/ammo Box Medium Is Sized Specifically For .50 Cal Ammo Storage With A Footprint That Won't Take Up Too Much Space. We Set The Interior Dimensions For .50 Caliber, But You'll Find This Storage Box Holds Much More Than Ammo. Load It Up With Tools, Electronics Or Anything Else That Needs Safe, Secure Storage. This Plano Box Is A Great Catchall For The Garage, Basement Or Work Shed!