Steel cased .45 isn't all that common in my area, and when you do find it there isn't a significant price savings over the lower end brass cased .45 ammo. My most expensive 1911 is my aluminum framed Colt CCO, and I probably wouldn't want to run it through that gun because of the aluminum feed ramp, but I would run it through my 1911's with steel frames. I'm not however going to purposely seek out steel cased ammo to run through my guns when I can readily get decent quality brass cased ammo for just a little bit more.