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I have shot steel and aluminum cased ammo in my pistols, although I don't make a regular practice of it.

But every single time I've seen a stuck case in an AR15 that wouldn't come out without banging on it with a wooden down pushed down the barrel, it was Wolf, or Tula, or some other cheap Russkie made steel cased ammo with a varnish coating of some kind on it. I've seen it enough times in someone else's rifle to convince myself to never use it in my own.