Most likely two things happened to that handgun; The dealer 'let' potential buyers do way too much dry firing while looking at the gun. And, the leading edge of the cylinder stop was never given a final fitting "break" that slightly rounded that edge. IMHO, you can do one of three things: send it back if they will agree to replace; polish the cylinder stop and 'break' that leading edge to reduce the cylinder turn line from getting any deeper in the future, going along with a polishing of the cylinder; and or purchase a brand new cylinder and cylinder stop and have them fitted by an expert.
This all gets back to a continual theme with me. Is your handgun a piece of jewelry to you? Or is it a valued tool that is going to show some wear as it is used? As a tool, your new handgun is going to change in appearance slightly in some place or another with each future shot. If you can't stand that appearance change.......keep it in the safe and never shoot it.
Yes, some production revolvers (especially Smiths) never develop much of a turn line, while other (as yours) develops a heavy turn line almost immediately. That is a function of how the cylinder stop was or was not fitted and polished as well as production tolerances 'stacking' in the wrong places.
I will leave this subject with this; a 'using' revolver is most likely going to have a turn line. As said, some worse than others. I have been known to take a NIB Smith from the box straight to my work bench and polish the portion of the cylinder stop that can ride against a turning cylinder and 'break' that leading edge while I'm doing same. That action is no guarantee that particular revolver will never develop the turn line, but I know that I have done what is possible to reduce that development to a minimum. ................
