Boy, you are not kidding about the filth in these barrels! My .223 was bad enough, but I have never seen as much muck as is in my .308 barrel. Last might I put at least 50 patches dampened with Patch Out and it still comes out black as coal. I poured a little down the barrel and used a .30 caliber brush and ran about 50 more patches through it, a little better, but still quite dirty. Maybe a "3rd cleaning" will finally clean?
Russellc
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