Ever heard the phrase "Commie ammo for Commie guns."? As you said above you have used a lot of it through your SKS. Not by coincidence the Russians design their guns specifically to shoot steel cased ammo. It's cheaper and they have an abundant supply. Hence their chambers are a little on the loose side, and you must admit they aren't the most accurate guns in the world. Steel does not have the same expansion properties as brass. Brass seals itself better to the chamber walls and being softer is easier on them while steel can scratch the chamber walls. Steel doesn't fully seal itself to the chamber walls which allows all sorts of unburnt powder to coat them, which leaves all sorts of crud in there to glue brass cases to if you don't scrub the chamber walls clean first. There are scores of stories on the internet about people having trouble with their guns after switching from steel cased to brass cased ammo. A simple Google search for steel vs brass cased ammo will get you pages of hits. And it has been explained in here for years ad nauseam. As has the fact that aluminum cased ammo and blowback actions do not play well together.
As for us (Ktog), it's simply easier on my arthritic old fingers to say Kel-tec (the manufacturer) DOES NOT RECOMMEND IT. Of course I am not allowed to do this, because then someone always wants to ask why. It was also linked in the FAQ until that took a powder with the software upgrade........
