Marks on the Back of Brass

[u/Ashs_Hitbox13]

good evening folks. I own two sakos. 1 90 and 1 100. and ive cycled some ammo and both have these marks on the back (no firing. that was just fired brass already). is this something I should worry about?

[u/Imaginary-Text4690]

Are you talking about the circle scratched on the bottom around the primer? Prolly just from the bolt rotating. You worded and pictured this in a really bad way no one understands and thinks your shoving the wrong rounds in the gun