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Do you know what the red polish material is in the Lyman walnut media or the green polish material is in the corncomb media.
SL1
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It's a rouge, or a very mild abrasive. Abrasives come in many grades, concerning their hardness, or what they will cut. The rouge thats on the pre-charged media is specifically made to only polish soft brass. So it won't touch tool steel or barrel steel.
Some G-moke over on the AR forum said he would never use a media additive because it would get inside the brass casings, then on the bullet, to get dragged down the barrel. At that time I was using flitz tumbler additive. I put some flitz on a felt fobb an spun it in a dremmel tool. I tried to get it to touch stainless steel table silverware, my loading dies, and an old piece of barrel cut off an old rifle barrel. It cleaned the steel, but would NOT abrade/cut it! It barely removed what was left of the bluing on that chunk of barrel.