Have seen it in CZ with CCI, WInchester, Speer, and Hornady.
Have seen it in Savage With Hornady and Federal.
Have seen it in My G-2 23" Barrel with Speer, Hornady,and Federal. I don't believe that they aneal the cases.
I have noticed you might shoot a box of fifty and never have a crack. Next fifty you will have half of them crack.
Does it hurt anything, I don't beleave so. I can't see anything in my chamber. I just scrub the chamber when I'm done shooting.