We do NOT recommend using steel case ammo in your firearm unless it was designed for it (think Russian Cold War firearms like the AK-47). Remember that the higher quality the firearm is, the LESS tolerant it is of non-standard ammo. That higher quality is due to tighter tolerances and more precise machining and assembly. Steel has different thermal expansion properties and different hardness than brass. We have recently had more issues with jammed steel-cased shells stuck in quality firearms than any other malfunction on the range. There are new start-up ammo manufacturers selling (expensive) steel-case ammo. Sellers may not clearly tell you that it’s steel case, so you need to check. Unless you are sure your loose-tolerance gun (ironically the less expensive and lower-quality guns) can safely cycle it (even when the firearm gets hot), we do not recommend it. We have to clear jammed guns before they leave the range. We’ve had to do it with large hammers and steel rods on steel-case jams (usually a plastic mallet with a brass rod will get stuck brass out). Hammering steel shells out of your steel firearm is not good for it. You CAN shoot it here; we recycle the steel as well as the brass, but use good judgement about the capability of your firearm to safely cycle that ammo.
