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I have reloaded steel .45 cases just to see what problems there were. The only one I found was that necks cracked earlier than with brass cases. Of course, the Army didn't give a darn about my reloading when copper and brass were in such tight supply.
I have heard the stories about steel cases causing excessive wear on loading dies and/or chambers, but I can't imaging how many thousands of rounds it would take to cause significant wear over brass cases. I think those are probably scare stories not based on any actual experience.
(The U.S. never was able to solve the problems involved in manufacturing steel .30 rifle cases during WWII. Use of steel case ammo by Germany during WWII caused some problems, mainly due to the melting of the case lacquer in hot MG chambers. AFAIK, the steel cases themselves gave no trouble either for the Germans or for the Soviet bloc which used them for everything.)
Jim
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