I don't shoot steel case ammo thru any of my 1911's ( just don't like the idea of it ....vs brass or nickel plated )..../ but I could see where it would cause some wear on the ramps...not the barrel chamber - at least not on a good match grade barrel.
Nickel plated doesn't seem to cause any wear...vs brass.../ but the nickel plated cases are harder to resize in my press and they're more brittle so they crack sooner.../ but I run nickel plated thru with the brass with no issues.
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