I shoot steel cased ammo through my AR. Matter of fact, I haven't put one round of brass through it yet. I'm at around 500 rounds.
You can't tell me that anyone can reload brass ammo cheaper than they can buy steel cased. I pay $5/box of 20 rounds.
Steel cased ammo is 100% safe to shoot in your firearm.
I run steel cased ammo in all of my firearms, rifle and pistols, and have for decades. I'm a cheap skate.
There are some myths out there that I can bust for you.
Myth: It damages extractors or ejectors.
This is completely false. The steel used in the case is extremely soft. Soft steel can not damage hardened steel, period. The steel used in cases isn't much harder than brass. Most handguns are designed to have the rim slide up under the extractor has the round feeds, it doesn't snap over it. This is a misconception passed around on the internet like crazy and it's completely untrue.
Myth: Steel ammo is "crap".
People think that steel = poor quality. That's also untrue. The ammo may seem like it's dirtier than other brands of ammo but that's because steel doesn't seal against the chamber walls like brass does so gas blows past the case back into the action. This carbon normally goes down the barrel, but with steel it comes back into the action. Just clean your gun more frequently. It's not damaging the gun. The powders and other materials used aren't any worse than other brands of range ammo like WWB or Federal Bulk Pack ammo.
Myth: Bi-metal bullets damage your bore.
Again, totally untrue. A bi-metal bullet has a lead core, a mild steel jacket over the lead then a copper jacket over the steel. The materials used in the construction of a bi-metal bullet are more more damaging to your bore than other bullet designs. It's not going to cause premature wear.
Some Wolf ammo might be loaded a little light, meaning it's not as powerful as other brands of ammo. This is especially true with their .223 ammo. Before buying cases of steel ammo for your firearm, buy a couple of boxes to test first. If it runs, shoot it like crazy. Save yourself some money.