This is more about pistol ammo than rifle ammo. Aside from the arguments about lacquered steel cases and dirty chambers, I'd like to know more about the effect of case expansion and contraction with steel cases as opposed to brass. I think that extraction problems are at least in part due to steel cases (.45 in particular) expanding upon firing and not contracting fast enough for the extractor to pull it out of the chamber. My though is that the case stays expanded just long enough that the extractor rolls over the rim. Anyone have any hard data on this?