Voruzon, here is a msds on the Remington bore cleaner. I would imagine the natural earth, is your abrasive/grit you feel. Probably fine silica (sand). An abrasive is an abrasive. It must be used with care as it will abrade all type of metals. I wouldn't use it everytime I cleaned the rifle. Only once in a while to remove copper build up you can't otherwise remove.
I have never gotten a completely clean patch. It always has some smuge on it. I spend about 10 to 15 min. (not counting the 15 min. I let the Benchrest copper cleaner soak). I use a bore brush every other cleaning. It keeps the copper, and lead build up off. It works for me.
http://www.remington.com/pdfs/msds/borecleaner.pdf
It takes a few min. to download.
I have never gotten a completely clean patch. It always has some smuge on it. I spend about 10 to 15 min. (not counting the 15 min. I let the Benchrest copper cleaner soak). I use a bore brush every other cleaning. It keeps the copper, and lead build up off. It works for me.
http://www.remington.com/pdfs/msds/borecleaner.pdf
It takes a few min. to download.