I'm new to the forum but have been working with and shooting machineguns for many years. I can say from experience that the copper "plated" or copper "washed" bullets have essentially the same effect on barrel wear that copper jacketed or gilding metal jackets do. The plating acts as a lube and despite the steel there is no more wear. In most firearms the principal cause of wear is from the erosion in the throat area because of the hot powder gasses. The throat wear will decrease the accuracy more than wear in the rest of the bore. The other factor in wear is heat and most pistol barrels will never get to the level where heat is a real factor in wear. Submachineguns rarely get to that level of temperature either and will fire many more rounds in a shorter time. I'd say that your lugers will be safe to shoot with the copper washed steel jacketed bullets.
Reinhardt
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