Originally Posted by Pisgah

As is usually the case when this topic comes up, it seems no one is interested in establishing exactly what is meant by "steel case" ammo. Is it ammo with a steel cartridge case, or ammo with a mild-steel-jacketed bullet?

Either way, the fact that literally billions of rounds of this type of ammo have been burned over the last 8 or 9 decades without any noticeable practical difference between this type or any other should suffice to convince the thinking man that there's not much to worry about, steel or no steel.