As already stated, millions of rounds of EC 45 ACP rounds were manufactured during the war much of which is still out there. A few cautions. They were all corrosive. With poor storage the bullets can be chemically "soldered" into the cases. When more of this ammo was commonly available this phenomenon was well documented, it raised pressures dramatically when fired. The solution was to bump the bullets slightly deeper to break this bond. Also, the primers were slightly undersized precluding using them for reloading. On the other hand, other GI steel cases , TW for example, have standard size primers and are reloadable. I have a handful of TW 5 head stamped steel cases that I have reloaded around 15 times. They were zinc plated which seems to last even through repeated resizings and dry tumbling. Never tried wet tumbling with them.