Thread: Resizing brass vertical marks on neck

Hi guys,

Have started reloading my 308 and for some reason there is vertical marks on the neck of the case being left. These are extremely light and most of it has even tumbled off, the bottom mark is barely felt with a fingernail. I'm using case lube and is lapia brass with RCBS dies

Is the brass fine to use? The fact it's symmetrical lines suggests it's not grit etc in die body?