I feel like shooting steel cased ammo is a lot like putting E-85 in your car, sure it is cheaper at the pump but is it really worth it in terms of increased wear and tear and decreased millage.

With that being said you can shoot steel case, but most of the primers/powers used in steel case rounds tend to burn dirtier and are more corrosive. Wear and tear on ejector is increased slightly, but the big thing is having a steel cased round when something bad happens, like a stove pipe jam. Brass is pretty soft and forgiving, steel is not.

If your are trying to shoot on a budget and are only going to shoot a couple hundred rounds a year, by all means shoot steel case. If you're shooting more than that I would spend the extra money on brass while ammo is still cheap.