I have been resizing a bunch of .300RUM cases with a RCBS full length resizing die. The necks of the brass have the faintest lines running down them. Taking the die apart and inspecting it revealed that the area that resizes the neck is not mirror smooth, rather it is the tiniest bit coarse. Couple of questions. Is this going to weaken the brass? The tooling would not be measurable in depth, but the neck is no longer as smooth as the body, if you run it along your fingernail it is a little "sticky" when compared to the smooth body of the case. I doubt that I could return the die set. Is this going to cause any problem with safety or with my chamber or is this common? I am pretty new to reloading. Thanks.