So I took my fist step towards reloading today and I tumbled all of the once fired factory brass I had. My father and I have been saving brass for years so some of it may be older. I the majority of the federal rounds had some discoloration around the neck. Almost looks like rust. The Remington ones didn't have nearly this amount.
Here is a picture
The two rounds on the left have the discoloration I am speaking of and the two on the right don't
Here is a link to the full resolution Picture so you can see better
Brass Full Size Picture
Is this just a cosmetic blemish or is it a structural defect. I tumbled them for an hour in walnut media. Should I tumble them longer or should It discard them? Any help is much appreciated.
Here is a picture
![4144793783_332d7a2517_o.jpg](http://farm3.static.flickr.com/2567/4144793783_332d7a2517_o.jpg)
The two rounds on the left have the discoloration I am speaking of and the two on the right don't
Here is a link to the full resolution Picture so you can see better
Brass Full Size Picture
Is this just a cosmetic blemish or is it a structural defect. I tumbled them for an hour in walnut media. Should I tumble them longer or should It discard them? Any help is much appreciated.