looks more like rolled pinched brass, not acceptable either way.
i guess they are pumping out so much ammo that they neglected to toss the brass during the forming process.
send a picture and lot number off to Winchester for a box or 2 of ammo.
I would, except I can't get ammo shipped here.I still may send them an email.
?? first few rounds after cleaning and oiling??? Looks a lot like the marks you get from too much lube in your resizing die. JMHO