In general, forearms manufacturers try to shy their customers away from steel cased and bi-metal ammo. It's more of a CYA on their part since numerous people have successfully used such ammo for quite some time.
That being said (this is my opinion. Many will have different ones) unless the firearm was designed with metal cased or bi-metal ammunition in mind, I would steer away from it. AK's were designed for such ammo. ARs, not so much. And I would most definitely not run steel ammo in a bolt rifle since their chambers tend to be kept at higher tolerances than a semiautomatic.