It seems like there are a lot of conversations on steel cases ammo, probably brought about by the current shortages as anything. Here is as good an article as I have read comparing the steel vs brass and it’s effect on your gun, both the steel case and the bi-metal jackets. Read and enjoy.
Interesting article. But sort of reinforced my belief in not using steel and to use Federal, which is what I have the most ammo for my AR-15’s
I read that a while back. Has a lot of good info but take it with a grain of salt, it was a torture test not how 99% people use their AR.
They are fair about that aspect and do a cost breakdown of shooting that much steel ammo plus barrel exchanges at the end.