Original US WWII 30 Caliber M1 Ammo Can By Crown The .30 caliber M1 steel ammunition can box was developed to deliver belts of 250 .30-06 cartridges for the .30 Cal. M1917 Browning machine gun. It has also been used for various calibers in cartons, clips, bandoleers or other packaging. The .30 cal. steel M1 ammo can replaced the wood Cal .30 Ammunition Box early in WW2. The M1 ammo can typically held a cloth or link belt of .30-06 cartridges. The same box was also used for other cartridges and was stencil marked to indicate the contents, The U.S. and the Ordnance flaming bomb is embossed on the hinge end. Usually the manufacturer embossed a form of their name above the U.S. (Canco, Reeves, Crown, etc.) An embossed cartridge shape indicated the orientation of the contained ammo.