Like a lot of reloaders, I have been using corn media for years. Just recently, I discovered the world of the Frankford Arsenal Wet Tumbler with the steel pin media. All I can say is.....why? Why did I know know about this sooner?.......I took some FC military brass that I've had for a while that was tumbled in corn media and then ran it through the steel pin treatment today for the first time....comparing some brass I had already loaded with the newly tumbled stuff and the difference is remarkable. The brass feels smooth to the touch and all of the dirt from around the neck (AR rounds) has been removed. Primer pockets are clean and the inside of the cases even looks clean. Looking forward to cleaning up some 9mm ready for it's next load. I can bet that the loading on the Dillon will not leave a ton of dirty residue that will lock up the primer delivery system next time. Happy Reloader!