Diamond Lifetime
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I've been reloading for over 50 years and during that time I've tried dry tumbling (Midway vibrating tumbler with corn cob, walnut, and a mixture of both equal parts) and it works. When the media is new it works fine, when the media gets old not so much. I've also wet tumbled using 1/4 cup white vinegar, one quart water, and a good squirt of Dawn dish soap. A couple hours of that and it comes out like new. And it usually cleans out most the primer residue. What's left doesn't affect squat. You do need to place your brass in a bucket and run a hose into it and let it run for a bit. Agitate it well every five minutes or so for three or four times. Drain throughly. Drying is optional but best on a real hot day in the sun, stirring them a few times. I've also put them on a wood stove (not for long, you are pulling and replacing cases the entire time) which works well. I've not tried the stainless pins but may in the future.
The one thing I have learned is that brass doesn't need to be store bought shiny, it needs to be clean and free of carbon deposits. I've shot plenty of ammunition with dark surfaces, it works just fine. I've also shot plenty of dented cases. As long as it chambers it will fire just fine. It's no different than fire forming a case, you're just ironing out a dent.
Just a bit of my experience.
The one thing I have learned is that brass doesn't need to be store bought shiny, it needs to be clean and free of carbon deposits. I've shot plenty of ammunition with dark surfaces, it works just fine. I've also shot plenty of dented cases. As long as it chambers it will fire just fine. It's no different than fire forming a case, you're just ironing out a dent.
Just a bit of my experience.