Looking at brass on Midway USA site and getting confused. My thought is I can easily separate my 10 mm brass (if nickel plated) from the 40 S&W brass. However, not sure if the nickel plating wears off. I will be tumbling my brass and keeping it clean. Just starting out in reloading and never bought components. Limited insight to say the least. -Dan Wanna kill these ads? We can help!