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In my experience, aluminum performs between brass and steel cases.
I've used it in pistols, but do not know that I'd do that now; especially in pistols with smaller or more fragile extractors.
That said, there was some steel cased .45acp made for a year or two by the US for use in WWII. Not sure how the 1911 took to it.
I'd treat it like steel case.
Regards,
Josh
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