Never heard of any problems in revolvers, a few problems with some autoloaders. A friend of mine was doing some testing on an AR pistol chambered in .40S&W, sorting out which mags worked best, what factory ammo provided the most reliability under different conditions. He was shooting upside down, sideways, double taps, doing everything he could think of to make the firearm fail to fire and the only problem he ran into was aluminum cases often having their rim ripped by the extractor. In short, he did not recommend using aluminum cases for this particular model of firearm. I'm a reloader and never had an interest in aluminum cases. I have picked up the odd box that shows up on the range table on a trial basis, never had any problems with it. It is easily disposed of in the range bucket, it all gets sorted and sold for scrap to fund the Junior's Program, they get a fairly decent price for mixed brass/aluminum, we ask people not to put steel in the bucket. It gets tossed into the trash they may remove it magnetically I do not know.
