You will probably stir a lot of opinions on that KyTB , I have never been afraid of running steel ammo in my weapons. The way I look at it, If i have a gun thats ammo picky i am not gonna trust my life to it with any type of ammo.
I have noticed no ill affects of any type. How much is an extractor ? prob under 30 bucks ? how many thousands of rounds til you wear it and how much ammo savings would that be ? HUGE!!
Now I dont give my Kimbers a steady diet of steel cased but they have fired some with no ill affects. Would I run it through a lower end 1911, hell ya. If I spent 2500 bucks on a nighthawk, I prob wouldn't skimp on ammo.