I'm sure others will argue, but MY opinion is the steel case ammo should stay in the guns DESIGNED around it, which is com-bloc----AK's, SKS, etc. To my knowledge, no US battlerifle was ever designed with steel case ammo in mind. Chamber dimensions, extractor issues (type of steel/ hardness) and othe things come to mind. AK's and such are designed from the ground up for a constant diet of the stuff, and I don't think to many Russian designed weapons can be called "flawed" in design or function. If its so much cheaper and equal, why haven't we (US) made SC ammo?
Also, with all the excellent deals on milsurp like SA out there, what would the savings be? Battlepacks are running less than $30 each-----buy it cheap-stack it deep.
ETA: I know guys that save a whopping 20 cents a box shooting 223 wolf in there AR's---Federal 223 is 3.99 a box, wolf is like 3.79----then they bitch about how gummed up the lacquer on the case makes the chamber once it gets hot, and how filthy it is. So for 20 cents savings, they're supporting a Russian company instead of US, and don't get any brass out of it (although they don't care about that)