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The key to the copper-wash/plated steel jackets being A-OK! for barrel life is the difference in hardness between the barrel steel and the jacket steel.
All steel-jacket stuff I've ever encountered was very mild steel. Engraves to the rifling quite well, much of the copper remains as a sort of metallic "lube", and the difference in hardness makes any steel directly on the bore quite "slippery" (as far as direct metal-bearing surfaces go) on the trip to the muzzle.
I'm going to check a few WWII M2 Ball and some '60s vintage LC M2 Ball tomorrow and see what's been in this area's supply pipeline.
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