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Wolf now uses a polymer coating on their shells. Lacquer is a thing of the past unless you get old ammo that's been sitting around in a mom and pop gun shop.
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From my experiences, neither the lacquer or the polymer coatings have anything to do with the problems caused by steel case ammo. I have seen both lacquer and polymer steel cases stick in AR15s. I've also heated lacquer cases to 500F plus and left it much longer than it would ever see that temperature in a rifle and no lacquer melted. I've even seen the Hornady training ammo fail to function in some AR15s and it is superlative ammo, although steel cased.
Clearly the straight walled 5.56x45 case and the chamber of an AR15 are not a great match for steel. My hypothesis is that the steel just doesn't expand the same as the brass and isn't as quick to shrink back. Certainly steel cases work in a lot of ARs with no problems; but just not as reliably as brass.